Search

The aim of this study was to evaluate different levels of feed restriction in the diet for F1 Holstein x Zebu cows during the winter on performance and economic viability. Data from Zootechnical book keeping, and from experiments conducted in the Experimental Field of Felixlândia, belonging to EPAMIG, were used. Total lactation of sixty F1 Holstein x Zebu cows receiving different diets was analyzed, by 2.00%, 2.25%, 2.50%, 2.75% body weight (BW), and a control group (3.4%; no feed restriction), allowing 5% leftovers in relation to the dry matter supplied, distributed in a completely randomized design. Data on milk production and feed cost were collected, evaluating the different periods that characterize the lactation of an animal. The highest milk production was found in the diet levels 3.4 %, and 2.75% BW, 3,636.00, and 3,271.50 kg, respectively. Lower milk production was observed at levels of 2.50%; 2.25%; 2.00% BW, respectively. The highest feed cost was verified without feed restriction followed by the levels of 2.75%, 2.50%, 2.25%, and 2.00% BW. The supply of the no feed restriction diet resulted in a performance superior to levels 2.75; 2.50; 2.25; 2.00% BW. The items profit, profitability were similar between all treatments, indicating that, when there is occasional feed shortage, a restriction in the diet supply of up to 2% BW provides economic security to the rural producer.

This study aimed to evaluate the fermentation profile and nutritional value of millet grain silages rehydrated with whey and/or molasses. The experiment was conducted in a completely randomized design with four treatments and six replications, with a control treatment (water rehydration), whey rehydration, water rehydration plus molasses (2.5%), and whey plus molasses (2.5%). Lower values of dry matter content (DM = 66.37; 1.55%) were found for the control silage, but within the recommended range. The contents of crude protein, neutral detergent fiber, acid detergent fiber, lignin and hemicellulose were not influenced by the use of additives. There was no difference (p>0.05) for aerobic stability and ammonia-N (6.04%) between treatments. For pH, lower values were observed for silages with molasses. There was a higher concentration (p

This study aimed to evaluate the effects of rehydration with water or acid whey, as well as the effects of bacterial-enzymatic inoculant on fermentation losses, aerobic stability, and chemical composition and in vitro digestibility of corn grain silages. The treatments consisted of corn kernels (Zea mays) ground through a 3-mm sieve and rehydrated with chlorine-free water or unsalted whey (NaCl) combined or not with bacterial-enzymatic inoculant. This was a 2 x 2 factorial completely randomized design with sources of rehydration (water or whey) and absence and presence of bacterial-enzymatic inoculant with eight replications. Water and acid whey were added to ground corn with 12% moisture in order to increase it to 35%. Rehydrated corn was ensiled in Polyvinyl chloride (PVC) minisilos and stored for 60 d. The bacterial-enzymatic inoculant used was composed of Lactobacillus curvatus, L. acidophilus, L. plantarum, L. buchneri, L. lactis, Pediococcus acidilactici, Propionibacterium acidipropionici and Enterococcus faecium, in concentrations of 1010 CFU g-1 and 5% cellulose-based enzyme complex. The aerobic exposure of silages was evaluated for 120 hours. There was interaction (P = 0.02) between the sources of rehydration and the use or not of the inoculant on the values of silage temperature during aerobic exposure. There was a difference for dry matter (DM) losses (P=0.38) between rehydrated corn silages with and without inoculant. DM losses were 37.51% higher in silage without inoculant compared to silage with inoculant (3.84% DM). There was no difference between the sources of rehydration on DM losses (P = 0.39), with a mean value of 4.99%. Corn rehydration using acid whey (P < 0.01) increased 2.19% and 31.36% DM and ash content compared to water, an average of 66.14% and 1.28%, respectively. There was no interaction (P = 0.30) between the sources of rehydration and the use of inoculants on the in vitro digestibility of DM (mean of 79.26%). The use of the bacterial-enzymatic inoculant improved the fermentation characteristics, aerobic stability and nutritional value of corn grain silage rehydrated with water or whey. Objetivou-se avaliar se os efeitos da reidratação com água ou soro de leite ácido, bem como os efeitos da inoculação enzimático-bacteriano influenciam as perdas fermentativas, estabilidade aeróbia e composição química e digestibilidade in vitro de silagens de grãos de milho. Os tratamentos consistiram dos grãos de milho (Zea mays) moídos na peneira de 3 mm e reidratados com água sem cloro ou soro leite sem sal (NaCl) associado ou não com inoculante bacteriano-enzimático. Foi utilizado o delineamento inteiramente casualizado em esquema fatorial 2 x 2, sendo fontes de reidratação (água ou soro de leite) e ausência e presença de inoculante enzimático-bacteriano com oito repetições. A água e soro de leite foram adicionados no milho moído com 12% de umidade visando aumentar para 35%. O milho reidratado foi ensilado em minisilos de Polyvinyl chloride (PVC) e armazenado durante 60 dias. O inoculante enzimático-bacteriano utilizado foi composto por Lactobacillus curvatus, L. acidophilus, L. plantarum, L. buchneri, L. lactis, Pediococcus acidilactici, Propionibacterium acidipropionici e Enterococcus faecium, em concentrações de 1010 UFC g-1 e 5% de complexo enzimático à base de celulose. A exposição aeróbia das silagens foi avaliada durante 120 horas. Houve interação (P=0,02) das fontes de reidratação e uso ou não do inoculante sobre os valores da temperatura da silagem durante exposição aeróbia. Houve diferença entre as silagens de milho reidratado sem e com inoculante sob as perdas de matéria seca (MS) (P=0,38). As perdas de MS foi 37,51% superior na silagem sem inoculante em comparação a silagem com inoculante (média de 3,84% da MS). Não houve diferença entre as fontes de reidratação sobre as perdas de MS (P=0,39), média de 4,99%. A reidratação do milho usando soro ácido (P < 0,01) aumentou 2,19% e 31,36% no teor de MS e cinzas em comparação à água, média de 66,14% e 1,28%, respectivamente. Não houve interação (P=0,30) entre as formas de reidratação e o uso de inoculantes sobre a digestibilidade in vitro da MS (média de 79,26%). O uso do inoculante enzimático bacteriano melhorou as características fermentativas, estabilidade aeróbia e valor nutricional da silagem de grãos de milho reidratada com água ou soro de leite.

The objective was to evaluate the structural, yield and nutritional characteristics of biomass sorghum BRS 716 managed in different row planting spacing and harvest age in a semiarid region of Brazil. Three row spacing (45, 70 and 90 cm; plots) and four maturity at harvest (70, 100, 130 and 160 days; subplots) were evaluated following a randomized block design in a 3 x 4 split plot arrangement, with eight blocks. The useful area was 3 x 15 m. Variation in soil fertility in the area was the blocking factor. There was interaction between row spacing and maturity at harvest (P < 0.05) on plant height (P = 0.01), dry matter yield (DMY; P < 0.01) and proportion of senescent material (P = 0.01). The DMY observed at the age of 160 days and spacing of 90 cm was 41.40% higher than the DMY at the same age and in spacings of 45 and 70 cm (mean of 21.45 t/ha). As the maturity at harvest increased, there was a reduction in the crude protein content (P < 0.01), potential degradability (P < 0.01) and effective degradability (P < 0.01) of dry matter, and the content of non-fiber carbohydrates (P < 0.01), total digestible nutrients (P < 0.01) and the readily soluble fraction (P < 0.01) of the dry matter increased. Considering the yield and nutritional characteristics of biomass sorghum BRS 716 managed in the semiarid region for silage production, the row spacing of 90 cm and the maturity at harvest of 160 days after planting are recommended. Objetivou-se avaliar as características estruturais, produtivas e nutricionais do sorgo biomassa BRS 716 manejado em diferentes espaçamentos de plantio e idade de corte em região semiárida do Brasil. Foram avaliados três espaçamentos entre linhas de plantio (45, 70 e 90 cm; parcelas) e quatro de idades de corte (70, 100, 130 e 160 dias; subparcelas) seguindo o delineamento em blocos casualizados em esquema de parcelas subdivididas 3 x 4 com oito blocos. A área útil da parcela foi de 3 x15 m. A variação da fertilidade do solo da área foi o fator de blocagem. Houve interação do espaçamento de plantio e as idades de corte estudadas (P < 0,05) sobre a altura das plantas (P=0,01), produção de matéria seca (PMS; P < 0,01) e proporção de material senescente (P=0,01). A PMS verificada na idade de 160 dias e espaçamento de 90 cm foi 41,40% superior a PMS verificada na mesma idade e nos espaçamentos de 45 e 70 cm (média de 21,45 t/ha). A medida de que aumentou a idade de corte houve redução no teor de proteína bruta (P < 0.01), degradabilidade potencial (P < 0.01) e degradabilidade efetiva (P < 0.01) da matéria seca e aumentou o teor de carboidratos não fibrosos (P < 0.01), nutrientes digestíveis totais (P < 0.01) e a fração prontamente solúvel (P < 0.01) da matéria seca. Considerando-se as características produtivas e nutricionais do sorgo biomassa BRS 716 manejado na região semiárida para produção de silagem, recomenda-se o espaçamento entre linhas de plantio de 90 cm e a idade de corte de 160 dias após o plantio.

The objective of this study was to evaluate the effects of two grazing management strategies on structural, productive and nutritional parameters of Marandu grass (Urochloa brizantha cv. Marandu). A completely randomized block design with two pasture management strategies and eight replications (blocks) was used. The grazing management strategies were: (1) low intensity rotational grazing (LI), with a pre-grazing sward height of 40 cm and a post-grazing sward height of 24 cm, i.e., a defoliation intensity of 50%; (2) High intensity rotational grazing (HI), with a pre-grazing sward height of 40 cm and a post-grazing sward height of 10 cm (±70% defoliation intensity). Pastures were sampled before and after grazing for estimation of forage mass, forage accumulation rate, structural characteristics, nutritional value and dry matter intake.The LI strategy resulted in higher dry matter production than HI before (18.33%) and after grazing (49.06%), increasing pre-grazing forage density by 13.21% (P < 0.05). The production of potentially digestible dry matter was highest (P < 0.05) in LI strategy (21.3% before and 39.6% after grazing, respectively). Higher post-grazing green forage mass (45%) increased the residual crude protein in LI. The LI management strategy increased forage mass production and can be used in Marandu grass pastures.

The objective of this study was to evaluate the effect of bacterial-enzymatic inoculants with different concentrations of fibrolytic enzymes on the fermentation quality and nutritional value of the silage of BRS capiaçu grass. Two bacterial-enzymatic inoculants with different levels of enzyme complex were evaluated (Silotrato® (5%) and Biotrato® (8%)) and control silage (without additive) according to a completely randomized design with eight replicates. To evaluate the silage aerobic stability, a completely randomized split plot design was used with three treatments (plots) and seven times after opening (subplots). There was no interaction between treatments and times after opening on values of pH (P=0.79). Regarding bacterial-enzymatic inoculants, the silage pH was 21.66% and 16.16% higher in silage without additive (mean of 6.00) compared to silage with 5% and 8% enzyme complex (P < 0.01). There was no difference between treatments on pH (P = 0.08), lactic acid (p = 0.08) and acetic acid (p = 0.64), means of 3.11, 47.31 g dry matter (DM)-1 and 11.19 g DM-1, respectively. There was no difference between treatments for any of the chemical composition variables (P = 0.86). Mean values for DM, crude protein, neutral detergent fiber and total digestible nutrients were 22.31%, 6.65%, 71.15% and 42.07%, respectively. There was a higher concentration of butyric acid in the control silage compared to Silotrato® silage. The control silage and silage treated with Biotrato® presented effluent losses (P = 0.05) 13.99% higher than silage with Silotrato®. For ensiling BRS capiaçu grass, it is recommended to use lactic acid bacteria containing 5% fibrolytic enzymes.

This trial aimed to analyze the replacement of forage sorghum silage (FS silage) with biomass sorghum silage (BRS 716 silage) in diets for heifers ¾ Holstein x ¼ Zebu on their nutrient intake and digestibility, nitrogen balance, microbial production, feeding behavior, and animal performance. Eight heifers with average age 18±4 months (mo) and average body weight (BW) 271 ± 57 kg were used. The experimental design was double-Latin square, 4×4, being four diets, four experimental periods and four animals. Four experimental diets with 0, 33, 67 and 100% substitution of forage sorghum silage with biomass sorghum silage were used. The roughage:concentrate ratio in the total dry matter (DM) of the diets was 75:25. The fraction “b” of DM was higher in the BRS 716 silage. There was no difference (p> 0.05) for dry matter intake (DMI; p = 0.45) and total digestible nutrients intake (p = 0.76). The dry matter digestibility (DMD), crude protein, ether extract and neutral detergent fiber increased linearly with the inclusion of BRS 716 silage. The feeding times, ruminating and idle have not been changed (p > 0.05). The replacement of FS silage with BRS 716 silage did not modify the average daily weight gain (ADG; p > 0.05; mean 1.30 ± 0.025 kg). Biomass sorghum silage can replace up to 100% forage sorghum silage in the diets of ¾ Holstein x ¼ Zebu heifers. Objetivou-se analisar a substituição da silagem de sorgo forrageiro (silagem FS) pela silagem de sorgo biomassa (silagem BRS 716) em dietas para novilhas ¾ Holandês x ¼ Zebu sobre o consumo e digestibilidade de nutrientes, balanço de nitrogênio, produção microbiana, comportamento alimentar e desempenho animal. Foram utilizadas oito novilhas com idade média de 18 ± 4 meses e peso corporal (PC) médio de 271 ± 57 kg. O delineamento experimental foi o quadrado latino duplo, 4 × 4, sendo quatro dietas, quatro períodos experimentais e quatro animais. Foram utilizadas quatro dietas experimentais com 0, 33, 67 e 100% de substituição da silagem de sorgo forrageiro pela silagem de sorgo biomassa. A relação volumoso: concentrado na matéria seca total (MS) das dietas foi de 75:25. A fração “b” da MS foi maior na silagem BRS 716. Não houve diferença (p > 0,05) para consumo de matéria seca (CMS; p = 0,45) e consumo de nutrientes digestíveis totais (p = 0,76). A digestibilidade da matéria seca (DMS), proteína bruta, extrato etéreo e fibra em detergente neutro aumentaram linearmente com a inclusão da silagem BRS 716. Os tempos de alimentação, ruminação e ócio não foram alterados (p > 0,05). A substituição da silagem FS pela silagem de BRS 716 não alterou o ganho em peso médio diário (GMD; p > 0,05; média 1,30 ± 0,025 kg). A silagem de sorgo biomassa pode substituir até 100% a silagem de sorgo forrageiro na dieta de novilhas ¾ Holandês x ¼ Zebu.

The objective was to evaluate the qualitative and nutritional aspects of elephant grass cv. BRS capiaçu silage with increasing proportions of silk cotton. A completely randomized design was used with five (0, 15, 30, 45, and 60% on natural matter basis) different inclusion proportions of silk cotton to elephant grass silage and four repetitions. Silages were prepared in PVC minisilos and remained ensiled for 42 days. The inclusion of silk cotton resulted in a linear reduction in dry matter (DM), neutral detergent fiber (NDF), acid detergent fiber (ADF), cellulose, and indigestible neutral detergent fiber (iNDF) contents at 0.06, 0.30, 0.23, 0.20, and 0.09 percentage points for each 1% inclusion, respectively. There was an increasing linear effect of crude protein (CP) and total digestible nutrients (TDN), with an increase of 39.32 and 20.89% from the lowest to the highest inclusion of silk cotton to elephant grass cv. BRS capiaçu silage. Values of pH, gas losses (GL), effluent losses (EL), dry matter recovery (DMR), hemicellulose, and lignin were not influenced by the evaluated inclusion levels, showing estimated averages of 3.87, 1, 42%, 11.55kg t-1 natural matter, 97.36%, 19.30%, and 7.20%, respectively. An increasing linear effect was found for fraction a, c, effective degradability (ED) (2% and 5%) dry matter, with an increment of 0.05, 0.0005, and 0.11 percent points, respectively. There was a quadratic effect for fraction b, potential degradability (PD), ED (2%), with minimum points of 23.72%, 50.52%, (at 45% inclusion level) 39.69%, (at 15% inclusion level) respectively. The indigestible fraction (IF) had a quadratic effect with a maximum of 49.48% at the 45% inclusion level. The colonization time (CT) linearly reduced by 0.09 percentage points for each 1% inclusion evaluated. According to the parameters evaluated, the inclusion of up to 60% silk cotton improved nutritional aspects and nutritional value of elephant grass cv. BRS capiaçu silage. Objetivou-se avaliar aspectos qualitativos e nutricionais da silagem de capim-elefante cv. BRS capiaçu com proporções crescentes de algodão-de-seda. Foi utilizado o delineamento inteiramente casualizado com cinco (0, 15; 30; 45; 60% na base da matéria natural) diferentes proporções de inclusão do algodão-de-seda à silagem de capim-elefante cv. BRS Capiaçu e quatro repetições. As silagens foram confeccionadas em silos de PVC e permaneceram ensiladas por 42 dias. A inclusão do algodão-de-seda resultou em redução linear nos teores de matéria seca (MS), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA), celulose e fibra em detergente neutro indigestível (FDNi) em 0,06, 0,30, 0,23, 0,20 e 0,09 pontos percentuais para cada 1% de inclusão, respectivamente. Houve efeito linear crescente da proteína bruta (PB) e nutrientes digestíveis totais (NDT), com incremento de 39,32 e 20,89% da menor à maior proporção de inclusão do algodão-de-seda à silagem do capim-elefante cv. BRS Capiaçu. O potencial hidrogeniônico (pH), perdas por gases (PG), perdas por efluentes (PE), recuperação de matéria seca (RMS), hemicelulose e lignina não foram influenciados pelos níveis de inclusão avaliados apresentando médias estimadas de 3,87, 1,42%, 11,55kg t-1 de MN, 97,36%, 19,30% e 7,20%, respectivamente. Foi observado efeito linear crescente para fração a, c, degradabilidade efetiva (DE) (2% e 5%) da matéria seca, com incremento de 0,05, 0,0005, e 0,11 pontos percentuais, respectivamente. Houve efeito quadrático para fração b, degradabilidade potencial (DP), DE (2%), com pontos de mínima de 23,72%, 50,52%, (no nível de 45 % de inclusão) 39,69%, (no nível de 15 % de inclusão) respectivamente. A fração indigestível (FI) apresentou efeito quadrático com máxima de 49,48% no nível de 45% de inclusão. O tempo de colonização (TC) reduziu linearmente em 0,09 pontos percentuais para cada 1% de inclusão avaliada. De acordo com os parâmetros avaliados, a inclusão de até 60% de algodão-de-seda à silagem de capim-elefante cv. BRS capiaçu favorece os aspectos nutricionais e o valor nutritivo das mesmas.

The objective of the present study was to evaluate the productive performance and nutritional value of forage of wheat and triticale cultivars at different harvest times in the semiarid region of Minas Gerais. Eight wheat cultivars and two triticale cultivars harvested at three stages of plant development were evaluated: Rubberization, grain at the stage of soft mass and harvest maturation. The experimental design adopted was a randomized block in a factorial scheme 10 × 3, with three replicates, 10 cultivars and 3 developmental stages for plant collection. The main agronomic characteristics and nutritional value were evaluated of forage of the cultivars under study. The study demonstrated the potential of wheat and triticale cultivation for forage in the semiarid region of Minas Gerais. The mean dry matter yield of wheat cultivars was 5.90 t ha -1, 7.85 t ha -1 and 7.98 t ha -1 and triticale 6.47 t ha -1, 9.97 t ha -1 and 10.5 t ha -1 for the rubber harvesting stages, grain at the stage of soft mass and harvest maturation, respectively. For the average crude protein content, the wheat cultivars showed 15.07%, 9.13%, 10.60% and the triticale cultivars showed 14.4%, 9.31% and 10.05% for the harvest stages of rubber formation, grain at the stage of soft mass and harvest maturation, respectively. When evaluating the average levels of total digestible nutrients, the wheat and triticale cultivars showed an average of 48.90% and 48.67% in the rubber harvesting stage and 42.68% and 49.60% in the grain in the mass stage suave and 44.43% and 42.90% at harvest maturation. The highest yield of digestible dry matter was observed with the cultivars harvested at the grain stage at the soft mass stage. Triticale IPR 111 and Wheat IPR PANATY had greater productive potential and better nutritional quality for use as forage. Objetivou-se com o presente estudo avaliar o desempenho produtivo e valor nutricional da forragem de cultivares de trigo e triticale em diferentes épocas de colheita no semiárido Mineiro. Foram avaliados oito cultivares de trigo e duas cultivares de triticale colhidas em três estádios de desenvolvimento das plantas: no Emborrachamento, grão no estádio de massa macia e maturação de colheita. O delineamento experimental adotado foi em blocos ao acaso em esquema fatorial 10×3, com três repetições sendo 10 cultivares e 3 estádios de desenvolvimento para colheita das plantas. Foram avaliadas as principais características agronômicas e o valor nutricional da forragem das cultivares em estudo. A pesquisa demonstrou o potencial do cultivo do trigo e triticale para forragem no semiárido de Minas Gerais. A produtividade média de matéria seca das cultivares de trigo foi de 5,90 t ha-1, 7,85 t ha-1 e 7,98 t ha-1 e triticale 6,47 t ha-1, 9,97 t ha-1 e 10,5 t ha-1 para os estádios de colheita de emborrachamento, grão no estádio de massa macia e maturação de colheita respectivamente. Para os teores médios de proteína bruta as cultivares de trigo apresentaram 15,07%, 9,13%, 10,60% e as cultivares de triticale 14,4%, 9,31% e 10,05% para os estádios de colheita de emborrachamento, grão no estádio de massa macia e maturação de colheita respectivamente. Ao se avaliar os teores médios de nutrientes digestíveis totais as cultivares de trigo e triticale apresentaram média de 48,90% e 48,67% no estádio de colheita de emborrachamento, 42,68% e 49,60% no grão no estádio de massa macia e 44,43% e 42,90% na maturação de colheita. A maior produtividade de matéria seca digestível foi observada com as cultivares colhidas no estádio de grão no estádio de massa macia. O Triticale IPR 111 e o Trigo IPR PANATY tiveram maior potencial produtivo e melhor qualidade nutricional para uso como forragem.

The objective of this study was to evaluate the BRS capiaçu grass silage combined with different hays of banana crop residue on fermentation profile, aerobic stability and nutritional value. The treatments consisted of elephant grass cv. BRS capiaçu (Pennisetum purpureum Schum.) ensiled with 37.44% banana peel hay, 36.06% banana pseudostem hay and 37.00% banana leaf hay, on a dry matter (DM) basis and control silage (no additive). The experimental design used was completely randomized, with five treatments and five replicates. Forage was collected when it reached 3.5 meters in height (90 days). Experimental PVC silos of known weight, 50 cm long, 10 cm diameter, were used for silage making. For all treatments, silage aerobic stability breakdown started after 64 hours exposure to air. The BRS capiaçu grass control silage or silage combined with pseudostem hay (mean of 73.15 kg t GM-1) presented effluent losses 40.46% higher than those observed for BRS capiaçu grass silage + banana leaf hay and 69.17% in relation the BRS capiaçu grass silage + banana peel hay. The inclusion of banana crop residue (hay) when ensiling BRS capiaçu grass decreased 13.93% gas losses compared to the control silage (mean of 3.11% DM). Higher values of total digestible nutrients, metabolizable energy and digestible energy content was found in BRS capiaçu grass silage + with banana peel hay. The greater in vitro dry matter digestibility and in vitro neutral detergent fiber digestibility was observed for BRS capiaçu grass silage combined with pseudostem hay. The inclusion of 37.44% banana peel hay improves the fermentation profile and aerobic stability of BRS capiaçu grass silage. Ojetivou-se por meio desta pesquisa avaliar a silagem de capim-BRS capiaçu associada com diferentes fenos de resíduos da cultura da banana sobre o perfil fermentativo, estabilidade aeróbia e valor nutricional. Os tratamentos consistiram de capim-elefante cv. BRS capiaçu (Pennisetum purpureum Schum.) ensilado com 37,44% de feno de casca de banana, 36,06% de feno de pseudocaule de banana e 37,00% de feno de folha de bananeira, à base da matéria seca (MS), e a silagem controle (sem aditivo). O delineamento experimental utilizado foi inteiramente casualizado com cinco tratamentos e cinco repetições. A forragem foi coletada quando atingiu 3,5 metros de altura (90 dias). Para a produção da silagem, foram utilizados silos experimentais de PVC de peso conhecido, com 50 cm de comprimento e 10 cm de diâmetro. Para todos os tratamentos, a quebra da estabilidade aeróbia da silagem iniciou a partir de 64 horas de exposição ao ar. A silagem de BRS capiaçu controle ou associada ao feno de pseudocaule (média de 73,15 kg t MN-1) apresentaram perdas de efluentes 40,46% maiores do que as observadas para a silagem de BRS capiaçu associada ao feno de folha de bananeira e 69,17% em relação à silagem de BRS capiaçu associada à casca de banana. A inclusão dos resíduos da cultura da banana (feno) na ensilagem do capim- BRS capiaçu diminuiu 13,93% as perdas por gases em comparação com a silagem controle (média de 3,11% da matéria seca - MS). Maiores teores de nutrientes totais digestíveis, energia metabolizável e energia digestível foram verificadas na silagem de BRS capiaçu associada à casca de banana. A maior digestibilidade in vitro da matéria seca e da fibra em detergente neutro foi verificada na silagem de BRS capiaçu associada com feno de pseudocaule. A inclusão de 37,44% de feno de casca de banana melhora o perfil fermentativo e a estabilidade aeróbia da silagem de capim- BRS capiaçu.

CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior The objective of this study was to evaluate the chemical composition, pH and rumen degradability of banana tree pseudostems pre-dried and ammoniated with different doses of urea (0, 0.5, 1.0, 1.5 and 2.0% in natural matter). The experiment consisted of five treatments (doses of urea) with six replications, following a completely randomized design. There was a linear increase in the pH (P < 0.01) of the banana tree pseudostems pre dried with the inclusion of urea. There was no difference (P > 0.05) in dry matter, ash, neutral detergent fiber, acid detergent fiber, lignin, non-fibrous carbohydrates and total digestible nutrients; the averages were 31.58, 18.82, 46.43, 9.30, 11.87 and 42.52%, respectively. The inclusion of 2% urea increased the crude protein content (P < 0.01) by 42.75%, the soluble fraction “a” by 31.82%, and the potential and effective degradability of dry matter by 15.49% compared to that of the control group (without urea). The potentially degradable fraction, time of colonization and ruminal repletion of the neutral detergent fiber of the pre-dried banana tree pseudostems were not altered with the inclusion of urea (P > 0.05). The ammonization of the pre-dried banana tree pseudostems with 2% of urea improved the chemical composition and rumen degradability of the dry matter. O objetivo deste estudo foi avaliar a composição química, pH e degradabilidade ruminal de pseudocaule de bananeira pré-secado e amonizados com diferentes doses de ureia (0, 0,5, 1,0, 1,5 e 2,0% em matéria natural). O experimento consistiu de cinco tratamentos (doses de ureia) com seis repetições, seguindo um delineamento inteiramente casualizado. Houve aumento linear do pH (P < 0,01) do pseudocaule de bananeira pré-secado com a inclusão de ureia. Não houve diferença (P > 0,05) na matéria seca, cinzas, fibra em detergente neutro, fibra em detergente ácido, lignina, carboidratos não fibrosos e nutrientes digestíveis totais; as médias foram 31,58; 18,82; 46,43; 9,30; 11,87 e 42,52%, respectivamente. A inclusão de 2% de ureia aumentou o teor de proteína bruta (P < 0,01) em 42,75%, a fração solúvel “a” em 31,82% e a degradabilidade potencial e efetiva da matéria seca em 15,49% em relação ao grupo controle (sem ureia). A fração potencialmente degradável, o tempo de colonização e a repleção ruminal da fibra em detergente neutro dos pseudocaules de bananeira pré-secado não foram alterados com a inclusão da ureia (P > 0,05). A amonização do pseudocaule de bananeira pré-secado com 2% de ureia melhorou a composição química e a degradabilidade ruminal da matéria seca.

The aim of the experiment was to evaluate the characteristics of the carcasses and meat of feedlot lambs that received diets supplemented with sunflower cake; correlations among the variables were also performed. The experimental design was a randomized block design with four treatments (sunflower cake added at 0, 10, 20, and 30% dry matter to the base diet) and seven replications per treatment. The diets were formulated with genotypes of Cynodon hay and corn- and soybean meal-based concentrate that were premixed at the ratio of 50:50 (hay:concentrate) and were fed to the lambs in two portions daily at 08:00 and 14:00. The feed conversion of the animals was adversely affected (P

The objective was to evaluate the rumen degradability of dry matter, crude protein and fiber fraction of some oilseed byproducts. Oilseed byproducts evaluated were: Sunflower Meal, Cotton Cake and Castor Bean Cake. The rumen degradability test was performed following a split plot randomized complete block design with three treatments (plots) and seven incubation times (subplots) and six blocks (animals). The readily soluble fraction of the dry matter of sunflower meal was 35.0% higher than the same fraction of cotton cake and castor bean cake (mean 24.46%, P < 0.01). The highest potential degradability of crude protein (P < 0.01) was verified in castor bean cake (96.90%, 5% rate of passage). Sunflower meal had the lowest insoluble fraction of the fiber fraction, 34.4%, compared to cotton cake and castor bean cake, with 64.4% and 39.4%, respectively (P < 0.01). Sunflower meal had the highest fiber effective degradability (25.2%). Sunflower meal presented better values of ruminal parameters of dry matter, crude protein and neutral detergent fiber in relation to the other byproducts.

The objective was to evaluate the effect of inclusion of acetic acid during the ensiling of sugarcane (Saccharum officinarum) on fermentation quality and nutritional value. The treatments consisted of sugarcane silages, variety (IAC 86-2480) additives with four inclusion levels of glacial acetic acid (1.5, 3.0, 4.5 and 6.0 % in natural matter) plus the control. A completely randomized design was used, being 5 treatments and 6 replicates. The glacial acetic acid showed a pH 2.9 (0,1M). There was a reduction of 0.07 units in the pH of the sugarcane silage for each 1% inclusion of acetic acid (P < 0.01). The N-NH3 concentration was not modified in the ensiled mass of the treatments, with a mean of 0.45% in dry matter (P =0.91). The averages of effluent losses were adjusted to the quadratic regression model with the application of acetic acid (P < 0.01). There was a reduction in the yeast population in the order of 0.44 log UFC/g of silage (P < 0.01). The addition of acetic acid in sugarcane silage reduces fermentative losses, the yeast population and improves the nutritional value in doses from 1.5% of natural matter.

The objective was to evaluate the productivity, chemical composition, ruminal degradability of dry matter and digestibility of BRS capiaçu grass (Pennisetum purpureum Schum.) managed at five regrowth ages. A completely randomized design with ten replications was used in the BRS capiaçu elephant grass subjected to five cutting intervals (30, 60, 90, 120 and 150 days) in the summer, making a total of 50 plots with a useful area of 4 x 2 m. There were daily increases in the dry matter production in the order of 382 kg ha-1, with 49,859 kg ha-1 being produced at 150 regrowth days. The dry matter content and organic matter linearly increased (P < 0.01) at different regrowth ages. The crude protein content, in vitro dry matter digestibility and in vitro digestibility of neutral detergent fiber linearly reduced (P < 0.01) 0.037%, 0.196% and 0.256% per day, respectively. Potential degradability of dry matter decreased from 68.9% at 30 days to 44.7% at 150 regrowth days (0.194 percentage units per day). The rate of degradation of fraction B 'c' was not modified (P = 0.94), averaging 1.46% hour-1. In the cultivation of BRS capiaçu elephant grass in the summer season, in the northern region of Minas Gerais, the age for harvesting between 90 and 120 days of regrowth is recommended.

CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais Outra Agência This study aimed to evaluate the kinetics of dry matter degradation and neutral detergent fiber of banana peel treated with limestone. The banana peel has been acquired from a candy manufacturer that after washing with chlorinated water to 1% and pulp removal was discarded. The banana peel in nature was treated with 1, 2, 3 and 4% of limestone in the natural matter, homogenized and pre-dried in the sun for 120 hours. The experiment was conducted in a completely randomized experimental design, with five treatments (0 (control), 1, 2, 3 and 4% inclusion of limestone) with 3 repetitions. The dry matter potential degradability, showed no difference (P>0.05) in the levels compared to the control with an average of 67.58%. The insoluble degradation fraction rate of dry matter and the fiber fraction did not differ (P> 0.05) between levels and control. In relation to effective degradability of neutral detergent fiber, there was an increase of 3.47% for each percentage unit increased limestone. In relation to the ruminal degradation parameters of dry matter and neutral detergent fiber is not recommended the utilization of limestone as an additive in the treatment of banana peel. Objetivou-se avaliar a cinética de degradação da matéria seca e fibra em detergente neutro da casca de banana tratada com calcário. A casca de banana foi adquirida de uma indústria de doces que após lavagem com água clorada a 1% e retirada da polpa, era descartada. A casca de banana in natura foi tratada com 1, 2, 3 e 4% de calcário na matéria natural, homogeneizadas e pré-seca ao sol durante 120 horas. O experimento foi realizado em um delineamento experimental inteiramente ao acaso, sendo cinco tratamentos (0 (controle), 1, 2, 3 e 4% de inclusão de calcário) com 3 repetições. A degradabilidade potencial da matéria seca, não apresentou diferença (P>0,05) dos níveis em relação ao controle com média de 67,58%. A taxa de degradação da fração insolúvel da matéria seca e da fração fibrosa não diferiu (P>0,05) entre níveis e o controle. Em relação á degradabilidade efetiva da fibra em detergente neutro, houve incremento de 3,47% para cada unidade percentual de calcário aumentada. Em relação aos parâmetros da degradação ruminal da matéria seca e da fibra em detergente neutro, recomenda-se a utilização 4% de inclusão de calcário na matéria natural da casca de banana.

CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Outra Agência This study aimed to evaluate the best level of inclusion of crude glycerin in elephant grass (Pennisetum purpureum Schum.) silage on fermentative profile, chemical composition and ruminal degradation of dry matter and fiber fraction in elephant grass silages. The experiment was conducted in a completely randomized design being used elephant grass cv. Napier with four levels of inclusion of glycerin (1,5, 10, 15% in natural matter) with six repetitions and the control treatment (exclusive silage elephant grass). Increasing linear effect was observed for each unit added glycerin percentage in natural matter (MN) an increase of 0.36% in the DM content of silages and increase of 0.32% in the ether extract. The fermentative quality of silage there was no difference in pH between the control silage and added with glycerine, with an average of 3.91. The degradability of the fiber, the addition of crude glycerin up to 15% increased by 7.2%; 53.8% and 36.5%, respectively, the insoluble fraction, but potentially degradable standardized “bp”, degradation rate of the fraction “bp”, “c” and effective degradability, respectively. Inclusion of 15% glycerin in natural matter improves the composition bromatological fermentative profile and ruminal degradation of dry matter and fiber fraction. Objetivou-se avaliar o melhor nível de inclusão de glicerina bruta em silagens de capim elefante (Pennisetum purpureum Schum.) sobre o perfil fermentativo, composição bromatológica e degradação ruminal da matéria seca e fração fibrosa. O experimento foi realizado em um delineamento inteiramente casualizado sendo utilizado o capim-elefante cv. Napier com quatro níveis de inclusão de glicerina (1,5, 10, 15% na matéria natural) com seis repetições e o tratamento controle (silagem exclusiva de capimelefante). Foi observado efeito linear crescente para cada unidade percentual de glicerina adicionada na matéria natural (MN) com incremento de 0,36% no teor de MS das silagens e aumento de 0,32% no extrato etéreo. Quanto a qualidade fermentativa da silagem não houve diferença nos valores de pH entre a silagem controle e as aditivadas com glicerina, apresentando média de 3,91. Quanto à degradabilidade da fibra, a adição de glicerina bruta em até 15% aumentou 7,2%; 53,8% e 36,5%, respectivamente, a fração insolúvel, mas potencialmente degradável padronizada “Bp”, taxa de degradação da fração “Bp” “c” e degradabilidade efetiva, respectivamente. A inclusão de 15% da glicerina na matéria natural melhora a composição bromatológica, perfil fermentativo e degradação ruminal da matéria seca e fração fibrosa.

Made available in DSpace on 2022-04-28T19:01:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-01 Aimed to evaluate the chemical composition and ruminal degradation of dry matter, crude protein and neutral detergent fiber of the leaves and the industrialization of waste guariroba for their use in ruminant feed, using the completely randomized design with four treatments (Residue Cleaning 1 (RL1); Waste Cleanup 2 (RL2); Residue Cleaning 3 (RL3)) and three replications. The sheet showed better dry matter (34.43%) and crude protein (10.40%) compared to cleaning residues. The potential and effective degradability of dry matter was higher in leaf guariroba (44.44 and 34.24%), respectively. There was a significant difference (P

FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Outra Agência The objective of this study was to evaluate the influence of different nitrogen doses on the forage accumulation, tillering and chemical characteristics of Braquiaria grass (Urochloa decumbens (Stapf) Webster cv. Basilisk). A randomized block design with four replications was used, and each plot (50 m²) was an experimental unit. The treatments consisted of four doses of N (100, 200, 300 and 400 kg ha-1year-1) and the control treatment. There was an increase in whole-plant crude protein (CP) and in leaf crude protein (LCP) and a decrease in whole-plant neutral detergent fiber (NDF) and leaf neutral detergent fiber (LNDF). Total dry matter accumulation (TDMA) and dry matter accumulation rate (DMAR) increased linearly in response to the N doses applied. Nitrogen fertilization promotes benefits such as increased biomass accumulation and improved forage chemical composition and tillering in Brachiaria grass. Objetivou-se avaliar a influência de diferentes doses de nitrogênio sobre o acúmulo, perfilhamento e características químicas do capim-braquiária (Urochloa decumbens (Stapf) Webster cv. Basilisk). Foi utilizado o delineamento experimental em blocos ao acaso, com quatro repetições, sendo cada parcela (50 m²) a unidade experimental. Os tratamentos consistiram em quatro doses de N: 100, 200, 300 e 400 kg ha-1 ano-1 e o tratamento-controle. Houve aumento da proteína bruta da planta inteira (PBT) e da proteína bruta das folhas (PBF), e redução da fibra em detergente neutro da planta inteira (FDNT) e das folhas (FDNF). O acúmulo total de matéria seca (ATMS) e a taxa de acúmulo de matéria seca (TACUMS) aumentaram linearmente em resposta às doses de N aplicadas. A adubação nitrogenada promove benefícios, como o aumento de acúmulo de massa e a melhoria da composição química de forragem, e o perfilhamento no capim-braquiária.

Made available in DSpace on 2015-03-18T15:56:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01Bitstream added on 2015-03-18T16:28:13Z : No. of bitstreams: 1 WOS000340334200041.pdf: 635849 bytes, checksum: 4e12d64fa91df8b77894354cbe1f112a (MD5) It was aimed to evaluate the chemical composition of grass silage-mombasa associated with different additives in four times of opening the silo. The experiment was conducted in UFGD. After harvesting the forage, biomass in natura crushed, was taken to the lab, homogenized and enriched on the basis of natural mass, with the following additives: 5% wheat bran, 5% of waste (broken grain and soy ice cream cone) of soybean, 5% urea in natural matter and the witness (without additive). The silos were opened after (unprocessed material), 15, 30 and 45 days, for the analysis of chemical composition. The data obtained were analyzed through the statistical programme SISVAR and averages were compared to 5% of probability, by Skott-Knot. The grass silage-mombasa without additive presented major (P0.05) of grass silage- mombasa associated with 5 of urea in 15 days and 45 of silage. The grass silage-mombasa with 5% urea showed the highest crude protein content at time 0 and differed from other treatments. The silage of mombasa associated with 5% urea provided greater in vitro digestibility of dry matter to 15 days of silage. UFGD, Fac Ciencias Agr, Dourados, MS, Brazil Univ Estadual Paulista, UNESP, Fac Ciencias Agr & Vet, Jaboticabal, SP, Brazil UFGD, Dourados, MS, Brazil Univ Estadual Paulista, UNESP, Fac Ciencias Agr & Vet, Jaboticabal, SP, Brazil

Objetivou-se avaliar o desempenho zootecnico e economico de cordeiros mesticos (½ Santa Ines + ½ Sulfolk), em confinamento, recebendo diferentes dietas a base de feno de genotipos de Cynodon dactylon , atraves do uso de indicadores financeiros considerando o periodo de confinamento, sem relaciona-lo com o manejo de ciclo completo. Foram utilizados 30 cordeiros, machos, nao castrados, mesticos Suffolk, identificados com brinco na orelha, com media de idade de 90 dias e peso corporal medio de 21,5 kg. As dietas foram formuladas utilizando um concentrado padrao e feno dos seguintes genotipos de Cynodon dactylon : Jiggs, Vaquero, Tifton 68, Coast-Cross, Tifton 85 e Russel, em uma relacao volumoso concentrado de 60:40, constituindo os tratamentos, distribuidos em um delineamento em blocos casualizados com 5 repeticoes. Houve diferenca significativa entre as dietas para as despesas totais com a alimentacao, sendo os maiores valores para o Jiggs (BRL 48,96/animal). Os animais que receberam dietas a base de feno de Tifton 68 apresentaram maior taxa de retorno (2,16%) e lucratividade (34,63%) em relacao as demais dietas. A utilizacao de dietas a base de feno de Tifton 68 para cordeiros em fase terminacao, em confinamento, permite obter maior rentabilidade economica em relacao as demais dietas.

Objetivou-se por meio deste trabalho avaliar o efeito de nitrogenio sobre a morfogenese e rendimento forrageiro do capim-elefante cv. Pioneiro. O delineamento experimental utilizado foi em blocos casualizados com cinco repeticoes, totalizando 20 unidades experimentais. Os tratamentos corresponderam a quatro doses de nitrogenio (100, 200, 300 e 400 kg ha-1 ano-1). O experimento foi mantido sob condicoes irrigadas. Foram realizados cortes avaliativos a 50 cm do solo com valores de interceptacao luminosa (95%) sem intervalos pre-definidos. Observou-se que a adubacao nitrogenada aumentou significativamente (P

Made available in DSpace on 2015-11-03T15:29:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01. Added 1 bitstream(s) on 2015-11-04T10:16:24Z : No. of bitstreams: 1 WOS000352019800036.pdf: 701630 bytes, checksum: b6a831050c30445ed39d79ca25053e96 (MD5) Fundação de Amparo à Pesquisa de Minas Gerais (FAPEMIG) Banco do Nordeste do Brasil (BNB) Objetivou-se com este trabalho avaliar a taxa de aparecimento foliar, taxa de alongamento foliar, número de folhas vivas, comprimento de lâminas e colmo da Brachiaria brizantha cv. Marandu submetida a diferentes doses de nitrogênio e duas alturas de resíduos. Foi utilizado delineamento em blocos casualizados, em esquema fatorial 4 x 2, sendo quatro doses de nitrogênio (100, 200, 300 e 400 kg de N ha -1 ano-1) e duas alturas de resíduos (5 e 15 cm). Foi encontrada interação significativa entre altura de resíduo e doses de nitrogênio para a taxa de aparecimento foliar (P>0,05) do capim-marandu, que foi influenciada linear e negativamente (P0,05) entre as doses de nitrogênio x altura de resíduo sobre o número de folhas verdes. A dosagem que proporcionou maior comprimento de colmo na altura de resíduo de 5 cm foi de 271,5 kg de N ha -1. Para a altura de 15 cm de resíduo, foi observado aumento de 0.0745 cm perfilho-1 dia-1 para cada 1 kg de N ha -1 aplicado. O manejo do pasto de Brachiaria brizantha cv. Marandu com 5 cm de altura de resíduo e adubação com 100 kg de N ha -1 promoveu melhor resposta das características morfogênicas estudadas. The objective of this study was to evaluate the rate of leaf appearance, leaf elongation rate, number of green leaves, length of blade and stem of Brachiaria brizantha cv. Marandu under different nitrogen levels and two residue heights. A randomized block design was used in a 4 x 2 factorial scheme, four doses of nitrogen (100, 200, 300 and 400 kg N ha(-1) year(-1)) and two residue heights (5 and 15 cm). There was significant interaction between residue height and nitrogen levels for leaf appearance rate of signal grass, which was influenced negatively and linearly by the residue heights being observed an average reduction of 28.20% from lower to higher residue. There was no interaction between the levels of nitrogen x residue height on the number of green leaves. The dosage that provided the highest stalk in the residue height of 5 cm was of 271.5 kg N ha(-1). An increase of 0.0745 cm tiller(-1) day(-1) for 1 kg of N ha(-1) applied to height of 15 cm of residue was observed. Nitrogen fertilization contributes positively to growth and development of rates of appearance and leaf extension. The management of pasture of Brachiaria brizantha cv. Marandu with 5 cm of residue and fertilization with 100 kg N ha(-1) provided better answer morphogenic traits. Universidade Estadual de Montes Claros, UNIMONTES, Janaúba, MG. Faculdade de Ciências Agrárias, Universidade Estadual do Sudoeste da Bahia, UESB, Itapetinga, BA. Faculdade de Ciências Agrárias e Veterinária, Universidade Estadual Paulista Júlio de Mesquita Filho, Departamento de Zootecnia, UNESP, Jaboticabal, SP.

Made available in DSpace on 2015-11-03T15:29:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01. Added 1 bitstream(s) on 2015-11-04T10:16:25Z : No. of bitstreams: 1 WOS000352019800035.pdf: 673643 bytes, checksum: bc8e0ef28c3247367b2d8b98222df731 (MD5) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Objetivou-se avaliar a cinética ruminal de cinco genótipos do gênero Cynodon (Tifton 85, Jiggs, Russel, Tifton 68 e Vaqueiro), colhidos com idades de 28, 48, 63 e 79 dias com potencial para fenação. Para a degradabilidade in situ utilizaram três novilhos com cânulas ruminais, com tempos de incubação de 96, 72, 48, 12, 6 e 0 hora. Utilizou-se o delineamento em blocos casualizados em esquema de parcelas subdivididas (gramíneas como parcelas e idade ao corte como subparcelas) com três repetições. Houve redução (P

This study aimed to evaluate body morphometry and qualitative traits of carcasses and meat of lambs in a feedlot, fed hay Cynodon genotypes: Jiggs, Vaquero, Tifton 68, Coast -Cross, Tifton 85 and Russel. The diets had forage to concentrate ratio of 60:40 for all levels of performance. The experimental design was a randomized block design with 6 treatments and 5 animals per treatment, randomly assigned according to body weight. There was no significant difference in slaughter weight, yield of carcass muscle and hot, with average values of 33.67 kg, 42.74 and 53.20%, respectively. There was a significant difference for heart girth and length of carcass, where the animals of the treatment Jiggs had greater in vivo measurements (78.40 and 67.60 cm, respectively). To the perimeter of leg, carcasses relating to Russel and Vaquero treatments had lesser extent. Lambs supplemented with hay Cynodon had potential for production of carcasses and meat quality.

Objetivou-se deste trabalho avaliar o desempenho agrotecnologico de duas variedades de cana-de-acucar influenciadas por diferentes epocas de supressoes de irrigacao e niveis de adubacao. As caracteristicas avaliadas foram: altura de planta (m), diâmetro do colmo (mm), n° de perfilho por m-1, Brix em caldo, Pol da cana, Pol do caldo, Acucar redutor, e Produtividade total. O experimento foi instalado em area da Fazenda Experimental da Unimontes, em Janauba na regiao Norte de Minas Gerais. O delineamento utilizado foi o de blocos casualizados, com tres repeticoes, em parcelas subdivididas (2 x 3 x 6), duas variedades de cana-de-acucar, RB85 5453 e SP80 1816, tres epocas diferentes de supressao de irrigacao (DIAP) e seis niveis distintos de adubacao NK. Os dados foram submetidos a analise de variância e, quando houve diferenca significativa pelo teste F, realizou-se a comparacao das medias pelo teste de Scott Knott (p < 0,05) para todas as variaveis estudadas, utilizando-se do programa software SISVAR. As variedades apresentaram comportamento diferente em maturidade, tendo a variedade RB85 5453 maiores valores em qualidade tecnologica e menores indices em produtividade. As variedades obtiveram media geral de 24,3° Brix, 17,6 % Pol da cana, 21 % Pol do caldo, 0,6 % AR, 3,08 metros na altura, 29,2 mm em diâmetro, 18,9 perfilhos m-1, 11,1 colmos m-1, 159,8 t ha-1 em produtividade. As variedades responderam as diferentes epocas de supressao de irrigacao (DIAP). O nivel 6 de adubacao proporcionou melhor desempenho nas condicoes de realizacao deste trabalho. As variedades RB85- 5453 e SP80-1816 sao promissoras para regiao Nortemineira.

Sorghum is a crop of great interest in animal feed in semiarid regions. The environment and nitrogen fertilization can influence its productive potential and nutritional quality. This study aimed to evaluate sorghum biomass genotypes associated or not with Azospirillum brasilense managed at different sowing sites on the yield and nutritional value of silage. We evaluated 3 sorghum genotypes combined with 3 fertilization strategies using urea, Azospirillum brasilense and the urea/A brasilense combination in two planting sites (Janaúba, MG, and Montes Claros, MG). A randomized block design was carried out in a 3 x 3 x 2 factorial arrangement of 3 genotypes, 3 fertilization strategies and 2 sowing sites. Azospirillum brasilense foliar spraying was carried out using a costal (Backpack) atomizer and for silage production, PVC silos with weight and length of 50 cm and 10 cm in diameter were used. There was no triple interaction between the studied variables. There were differences between genotypes and between sites for agronomic traits.Statistical differences were detected between genotypes and sites for chemical composition, and sorghum forage on digestibility evaluations. The region of Montes Claros has greater forage production and the region of Janaúba has better quality of silage. Biomass sorghum genotypes have higher forage production and the Volumax genotype has better silage quality. RESUMO - O sorgo é uma cultura de grande interesse na alimentação animal em regiões semiáridas. O ambiente e a adubação nitrogenada podem influenciar seu potencial produtivo e qualidade nutricional. Este trabalho teve como objetivo avaliar genótipos de biomassa de sorgo associados ou não ao Azospirillum brasilense manejados em diferentes locais de semeadura sobre a produtividade e valor nutricional da silagem. Foram avaliados três genótipos de sorgo associados e três estratégias de adubação utilizando ureia, Azospirillum brasilense e a associação ureia/A. brasilense em dois locais de plantio (Janaúba, MG e Montes Claros, MG). O delineamento foi em blocos casualizados em esquema fatorial 3 x 3 x 2, com 3 genótipos, 3 estratégias de adubação e 2 locais de semeadura. A pulverização foliar de Azospirillum brasilense foi feita com o auxílio de um atomizador costal e para a produção de silagem foram utilizados silos de PVC com peso conhecido e comprimento de 50 cm e 10 cm de diâmetro. Não houve interação tripla entre as variáveis estudadas. Houve diferenças entre genótipos e entre locais para características agronômicas. Também foram observadas diferenças estatísticas entre os genótipos e locais estudados para a composição química e forrageira de sorgo nas avaliações de digestibilidade. A região de Montes Claros possui maior produção de forragem e a região de Janaúba possui melhor qualidade de silagem. Os genótipos de sorgo biomassa apresentam maior produção de forragem e o genótipo Volumax apresenta melhor qualidade de silagem. Made available in DSpace on 2022-06-09T11:19:21Z (GMT). No. of bitstreams: 1 Yield-and-nutritional-value-of-sorghum.pdf: 365529 bytes, checksum: bdb8c33e2072bcb9e2a8f260ac8abc2f (MD5) Previous issue date: 2022