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The present study was carried out to evaluate the in situ degradation of dry matter (DM), neutral detergent fiber (NDF) and crude protein (CP) in roughages by the in situ caecal digestion technique in horses. The roughages evaluated were: Lucerne hay (Medicago sativa), peanut (Arachis pintoi cv. Amarillo), desmodio(Desmodium ovalifolium), stylo (Stylosanthes guianensis cv. Mineirão), pigeon pea (Cajanus cajan), lime-yellow pea (Macrotyloma axillare) and coastcross hay (Cynodon dactylon cv. coastcross). The assay was conducted in a complete randomized design with seven roughages and three replications. One mare with a cannula fitted in the caecum was used, fed diet consisting of coastcross hay (80%) and concentrate (20%) at 2.0% BW, four times a day. Nylon 6.5 × 20 cm bags were used with 45 μ/pore, containing 5.2 g DM/bag, inserting 3 or 4 bags in the caecum at the times of 2, 4, 6, 8, 12, 24 and 48 hours incubation. The caecum in situ degradability parameters of nutrients were obtained by Ørskov model. The DM degradability parameters of all the roughages were significant. There was no fit to the model for pigeon pea for CP and NDF and desmodio. Peanut, stylo and lime-yellow pea presented larger potentially degradable DM with values of 53, 46.5 and 40%, respectively, and higher values for the soluble fraction of 20, 21, 28.6%, with high degradability rates of 10.36, 20.26 and 14.8% h-1. Higher NDF degradation rates were observed in these foodstuffs with values of 9.1 and 11.3, 11.2% h-1, high potentially degradable fraction with values of 55, 51.8 and 47.2%, and greater CP degradation at 48 hours with values of 87, 95, and 94.8%. Peanut, stylo and lime-yellow pea presented potential for use in horses diets. Objetivou-se avaliar a degradação da matéria seca (MS), fibra em detergente neutro (FDN) e proteína bruta de alimentos volumosos pela técnica da digestão cecal in situ em equinos. Avaliaram-se as forrageiras: feno de alfafa (Medicago sativa), amendoim forrageiro (Arachis pintoi cv. Amarillo), desmódio (Desmodium ovalifolium), estilosantes (Stylosanthes guianensis cv. Mineirão), guandu (Cajanus cajan), macrotiloma (Macrotyloma axillare) e feno de coastcross (Cynodon dactylon cv. coastcross). O ensaio teve duração de 35 dias e foi realizado em delineamento inteiramente casualizado com sete alimentos e três repetições. Utilizou-se uma égua fistulada no ceco, alimentada com dieta composta por feno de coastcross (80%) e concentrado (20%), fornecida quatro vezes ao dia em quantidade equivalente a 2% do peso vivo. No ceco, foram inseridos 3 a 4 sacos de náilon de porosidade 45 μ de 6,5 × 20 cm, contendo 5,2 g de MS/saco, nos tempos de 2, 4, 6, 8, 12, 24 e 48 horas de incubação. Os parâmetros de degradação da MS de todos os volumosos foram significativos. Não houve ajuste no modelo de degradação da PB e FDN do guandu. O amendoim, estilosantes e macrotiloma apresentaram maior fração potencialmente degradável da MS, com valores de 53, 46,5 e 40%, respectivamente, e os maiores valores da fração solúvel de 20, 21, 28,6%, além de elevadas taxas de degradação (10,36, 20,26 e 14,8%h-1). Nestes alimentos, também foram observadas as maiores taxas de degradação da FDN (9,1 e 11,3, 11,2%h-1), das frações potencialmente degradáveis (55, 51,8 e 47,2%) e as mais altas taxas de degradação da PB em 48 horas de incubação (87, 95, 94,8%, respectivamente). O amendoim forrageiro, o estilosantes e o macrotiloma apresentam potencial de uso nas dietas para equinos.

Objetivou-se estimar a digestibilidade de nutrientes de forrageiras em eqüinos utilizando-se a técnica de sacos de náilon móveis. Foram avaliados alfafa (Medicago sativa), amendoim forrageiro (Arachis pintoi), desmódio (Desmodium ovalifolium), estilosantes (Stylosanthes guianensis), guandu (Cajanus cajan), macrotiloma (Macrotyloma axillare) e capim-coastcross (Cynodon dactylon cv. coastcross). O delineamento foi em blocos inteiramente casualizados com sete alimentos e cinco blocos (animais). Foram utilizados cinco eqüinos mestiços com 17 a 27 anos de idade e peso vivo médio de 350 kg. O ensaio teve duração de 12 dias: três para a adaptação às baias, cinco para inserção gástrica dos sacos através de sonda nasogástrica e quatro de coleta dos sacos nas fezes. No período pré-experimental de 30 dias, os animais foram mantidos em piquetes com dieta composta de 80% de feno de coastcross e 20% de concentrado. Na confecção dos sacos, utilizou-se náilon com porosidade de 45 µ e dimensão de 7,5 × 2 cm. Em cada saco, foram inseridos 510 mg de matéria seca de amostra do alimento. Os coeficientes de digestibilidade dos nutrientes das forragens foram calculados considerando o resíduo obtido no saco. A digestibilidade dos nutrientes do amendoim, estilosantes e macrotiloma foram superiores à da demais forrageiras, com destaque para a digestibilidade da proteína bruta, cujos valores foram de 91,4; 94,9 e 97,0%, respectivamente. O amendoim e macrotiloma apresentaram digestibilidade da fibra em detergente neutro de 72,3 e 65,2% e da fibra em detergente ácido de 70,9 e 59,4%, respectivamente. O amendoim forrageiro, macrotiloma e estilosantes apresentam digestibilidade dos nutrientes satisfatória e têm potencial para o uso em dietas para eqüinos. This work was carried out to evaluate the nutrient digestibility of forages using mobile bags technique in horses. The forages were lucerne (Medicago sativa), peanut (Arachis pintoi), desmodio (Desmodium ovalifolium), stylo (Stylosanthes guianensis), pigeon pea (Cajanus cajan), lime-yellow pea (Macrotyloma axillare) and coastcross (Cynodon dactylon cv. coastcross). A randomized block design was used with seven treatments (feeds) and five blocks (horses). Five crossbreed horses were used with age ranging from 17 to 27 years and average weight of 350 kg. The assay lasted 12 days, being three days for adaptation to barns, five days for nasogastric insertion of bags and four days for bags collection in feces. The diet of horses was composed of 80% of coastcross hay and 20% of commercial concentrate. During the pre-experimental period of 30 days, the horses were maintained in paddocks feeding the diet. Nylon cloth had 45µ pore size, and bags presented dimensions of 7,5 × 2 cm with 510 mg of DM of forage sample/bag. The nutrient digestibility of forages were calculated through residues inside the bags. The nutrient digestibility of peanut, stylo and lime-yellow pea were high than the other forages, mainly crude protein with values of 91.4, 94.9 and 97.0%, respectively. Fibrous fractions of peanut and lime-yellow pea presented digestibility values of NDF of 72.3 and 65, 2%, and ADF of 70.9 and 59.4%, respectively. Peanut, lime-yellow pea and stylo presented satisfactory nutrient digestibility and had potential to use in diets for horses.

Made available in DSpace on 2015-03-18T15:56:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01Bitstream added on 2015-03-18T16:28:16Z : No. of bitstreams: 1 WOS000340334000042.pdf: 331084 bytes, checksum: 4a1cdc19e751c1cf59058226bdea4147 (MD5) The aim of this study was to evaluate the effect of different carbohydrate sources associated with sunflower oil on intake, digestibility of nutrients and nitrogen balance in diets of lambs. Twenty lambs were used, assigned in a completely randomized design with a 2 x 2 factorial arrangement of treatments with two sources of neutral detergent soluble carbohydrate, starch and neutral detergent soluble fiber, with and without the inclusion of 4.2% sunflower oil. The dry matter intake was not affected by carbohydrate sources and the inclusion of oil. Diets with a high percentage of starch provided higher digestibility of dry matter, starch and ether extract. The different sources of carbohydrates had no interference on digestibility of organic matter, crude protein, neutral detergent soluble fiber, nonfiber carbohydrates, neutral detergent fiber, hemicellulose and acid detergent fiber. The addition of oil in the diets increased the digestibility of ether extract. The combination of 4.2% oil in the diet high in soluble neutral detergent fiber had no influence on the nutrient digestibility, otherwise, the addition of oil at high starch diet caused a significant reduction in the digestibility of organic matter, neutral detergent fiber, hemicellulose and nonfiber carbohydrates. The quantities of nitrogen intake, absorbed and retained, did not differ as sources of carbohydrates and oil inclusion in the diet. The association of 4.2 % sunflower oil to the different sources of carbohydrates in the diet does not affect consumption and nitrogen metabolism in lambs. The addition of 4.2 % oil in the diet with high starch (28% of DM diet) promotes reduction in digestibility of organic matter, of fibrous and nonfibrous carbohydrate in the diet. Univ Estadual Paulista, UNESP FCAV, Jaboticabal, SP, Brazil UNESP, FCAV, Dept Zootecnia, Jaboticabal, SP, Brazil Univ Estadual Paulista, UNESP FCAV, Jaboticabal, SP, Brazil UNESP, FCAV, Dept Zootecnia, Jaboticabal, SP, Brazil