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Oitenta leitoas (24,2±1,52kg) com alto potencial genético para deposição de carne na carcaça foram distribuídas em experimento de blocos ao acaso para avaliar cinco níveis de lisina digestível (Ld) (9, 10, 11, 12 e 13g kg-1) durante a fase de crescimento (63 a 103 dias de idade). Os animais foram alojados em pares e alimentados à vontade. No início e ao final do período experimental, as leitoas foram pesadas e submetidas à análise de ultrassom para avaliação da área de olho de lombo (AOL) e espessura de toucinho (ET). Os níveis de Ld proporcionaram aumento linear (P0,05) dos níveis de Ld sobre o consumo de ração diário (CRD) e ET. Os níveis de 12,0 e 12,5g kg-1 de Ld na dieta, correspondentes, respectivamente, ao consumo de lisina digestível diário (CLdD), de 23,6 e 24,6g, proporcionam os melhores resultados de desempenho e área de olho de lombo de leitoas em fase de crescimento (63 aos 103 dias de idade).

The purpose of this study was to evaluate the effect of temperature and different levels of available phosphorus (aP) on the expression of nine genes encoding electron transport chain proteins in the Longissimus dorsi (LD) muscle of pigs. Two trials were carried out using 48 high-lean growth pigs from two different growth phases: from 15 to 30 kg (phase 1) and from 30 to 60 kg (phase 2). Pigs from growth phase 1 were fed with three different levels of dietary aP (0.107%, 0.321% or 0.535%) and submitted either to a thermoneutral (24°C and RH at 76%) or to a heat stress (34°C and RH at 70%) environment. Pigs from growth phase 2 were fed with three different levels of dietary aP (0.116%, 0.306% or 0.496%) and submitted either to a thermoneutral (22ºC and RH at 77%) or to a heat stress (32ºC and RH at 73%) environment. Heat stress decreased (P

Este estudo foi realizado com o objetivo de avaliar níveis de zeólita em dietas para suínos e seus efeitos no desempenho, nas características de carcaça e nos parâmetros sanguíneos e histopatológicos do parênquima hepático desses animais nas fases de crescimento e terminação. Foram utilizados 84 suínos machos castrados, híbridos comerciais de alto potencial genético para deposição de carne, com peso inicial de 30,34±1,14 kg, distribuídos em delineamento experimental de blocos ao acaso, com sete níveis de adsorvente (0,0-0,0; 1,0-0,5; 1,0-1,0; 2,0-1,0; 2,0-2,0; 3,0-1,5; 3,0-3,0, respectivamente, nas fases de crescimento e terminação), com seis repetições e dois animais por baia (unidade experimental). Utilizou-se o sorgo como fonte de contaminação natural por micotoxinas. Os níveis de adsorvente das dietas experimentais foram obtidos a partir da inclusão de zeólita em substituição à areia lavada das dietas sem adsorvente. Não houve efeito dos níveis de zeólita nas dietas sobre o consumo diário de ração, o ganho de peso diário, a conversão alimentar e as características carcaça avaliadas. Os níveis de zeólita nas dietas também não influenciaram os parâmetros sanguíneos e histopatológicos nem os teores ósseos de cálcio e fósforo dos suínos. Devido ao bom índice de desempenho e às características de carcaça, bem como à normalidade dos outros parâmetros estudados dos animais que receberam dieta sem adsorvente, pode-se inferir que as dietas continham baixo grau de contaminação por micotoxinas. Os níveis de zeólita avaliados não influenciam o desempenho, as características de carcaça nem os parâmetros sanguíneos e histopatológicos do parênquima hepático de suínos nas fases de crescimento e terminação recebendo dietas com baixo nível de contaminação por micotoxinas. ABSTRACT - This study was conducted to evaluate levels of inclusion of zeolite in diets for pigs on performance, carcass characteristics, blood and liver histopathological parameters of these animals in their growing-finishing phases. Eighty-four barrows from commercial hybrids of high genetic potential for meat deposition, with initial weight of 30.34±1.14 kg were distributed in randomized blocks design, with seven levels of adsorbent (0.0-0.0; 1.0-0.5; 1.0-1.0; 2.0-1.0; 2.0-2.0; 3.0-1.5; 3.0-3.0, respectively, on growing and finishing phases), six replicates with two animals per pen, which was considered the experimental unit. Sorghum was used as naturally contaminated source of mycotoxins. The different levels of adsorbent in the diets were obtained by the supplementation of zeolite in the basal diet. The inclusion of zeolite in the diet did not affect the daily feed intake, daily weight gain, feed conversion or the carcass characteristics of the pigs. In the same way blood parameters, liver histopathological examination and the bone concentration neither calcium nor phosphorus were affected by the different levels of zeolita. Due to the good performance and carcass characteristics, as well as the normality of the other parameters of the animals fed diets without adsorbents analyzed, it can be inferred that the diets had low levels of mycotoxin contamination. The levels of zeolite do not affect the performance, carcass characteristics, blood parameters or liver histopathological examination in growing-finishing pigs fed diets with low level of contamination by mycotoxin.

This experiment was conducted to determine the requirement of available phosphorus (aP) for pigs kept in hot environment. Seventy-two pigs (36 castrated males and 36 females) with initial weight of 15.10±0.31 kg were allotted in a completely randomized block design with six treatments (0.107, 0.214, 0.321, 0.428, 0.535, and 0.642% of aP), six replicates and two pigs (1 castrated male and 1 female) per experimental unit. Pigs were kept in a hot environment with temperature of 34.1±0.8 ºC. The levels of aP influenced the daily weight gain, which increased quadratically up to the estimated level of 0.477%, and feed conversion, which improved quadratically up to the estimated level of 0.457%. The levels of aP also influenced the content of phosphorus in the bone, which increased quadratically up to the estimated level of 0.529%. The available phosphorus requirement of 15- to 30-kg pigs kept in a hot environment, for the best results of daily weight gain, feed conversion and bone parameters are 0.477, 0.457, and 0.529%, corresponding to the estimated daily available phosphorus intakes of 4.75; 4.55 and 5.27 g, respectively.

Um experimento foi realizado com o objetivo de avaliar o efeito da substituição de até 30% do milho da dieta por triguilho adicionando ou não enzimas sobre a utilização digestiva da energia e balanços do nitrogênio e fósforo. Foram utilizados 24 suínos machos castrados, meio irmãos, com PV médio inicial de 51,62kg e final de 62,95kg, alojados em gaiolas metabólicas mantidas em ambiente semi-climatizado. Foi utilizado um fatorial 3 x 2 (3 níveis de inclusão do triguilho - 0, 15 e 30%, com ou sem adição de enzimas), com quatro repetições cada, sendo o animal a unidade experimental. A inclusão de níveis crescentes de triguilho até 30% da dieta e a adição de enzimas não influenciou (P > 0,05) a digestibilidade da MS, da EB, da ED, a metabolizibilidade da energia, a retenção e as excreções fecais e urinária de nitrogênio. No entanto, a adição de 30% de triguilho reduziu (P < 0,05) a excreção fecal de P e aumentou (P < 0,05) a absorção do fósforo. A análise de regressão mostrou que para cada grama de triguilho adicionada à dieta o P fecal reduz em 0,05 g e absorção aumenta 0,11 gramas. A substituição de até 30% do milho por triguilho não afeta o balanço energético e do N, mas melhora o balanço do fósforo. A adição de enzimas exógenas não afeta os paramentos digestivos e metabólicos dos suínos. An experiment was carried out to evaluate the effect of the substitution until 30% of the diet corn for wheat middling with or without addition of enzymes on the digestive utilization of the energy and nitrogen and phosphorus balances. Twenty-four barrows were used, half brothers, with 51.62 kg initial BW, housed in metabolic cages maintained in semi-acclimatized atmosphere. A 3 x 2 factorial design was used (3 wheat middling levels - 0, 15 and 30%, with or without addition of enzymes), with four replications each, being the animal the experimental unit. The increased levels of wheat middling until 30% and the addition of enzymes did not influence (P > 0.05) the digestibility of the dry matter, crude energy, digestible energy and metabolized energy and energy metabolizibility, N retention, fecal and urinary N losses. However, the addition of 30% of wheat middling reduced (P < 0.05) the fecal excretion of P and increased (P < 0.05) the P absorption. The regression analysis showed that for each wheat middling gram added to the diet, fecal P reduces in 0.05g and absorption increases 0.11g. The substitution until 30% of the diet corn for wheat middling did not affect the energy and N balances, but it improved P balance. The addition of exogenous enzymes did not affect the digestive and metabolic parameters.

This experiment was conducted to evaluate nutritional plans of digestible lysine (DLys) for growing-finishing gilts. Eighty gilts with 63 days of age and an initial weight of 24.2±1.52 kg were distributed in a completely randomized block design, with five nutritional plans of DLys (9-8-7, 10-9-8, 11-10-9, 12-11-10, and 13-12-11 g/kg, from 63 to 103, 104 to 133, and 134 to 153 days of age, respectively) and eight replicates. Pigs were housed in pairs and fed their respective diets ad libitum throughout the experimental period (90 days). To monitor the animal development along the experiment at 103 and 133 days, gilts were weighed and subjected to analysis of ultrasound for evaluation of loin depth (longissimus dorsi) and backfat thickness. At the end of the experiment (153 days of age) the animals were weighed, and after slaughter carcasses were evaluated individually using a typifying pistol to evaluate the percentage and the content of carcass meat, loin depth and backfat thickness. From 63 to 133 days, there was no effect of the nutritional plans on daily feed intake, performance, or backfat thickness; however the loin depth was greater in the gilts that received plans with high levels of DLys (12-11; 13-12 g/kg) compared with the plan with the lowest level (8-7 g/kg). For the entire period (63 to 153 days), no influence of the nutritional plans was observed on the daily feed intake, performance variables, or carcass characteristics. A nutritional plan containing 9-8-7 g/kg of digestible lysine fed from 63 to 103, 104 to 133 and 134 to 153 days, respectively, meets the requirements for performance and carcass characteristics of growing-finishing gilts.

Ninety-six barrows from 63 to 103 days of age were used to evaluate the effects of dietary digestible lysine levels on performance and carcass traits of two genetic lines selected for lean deposition. Pigs with initial body weight of 23.800 ± 1.075 kg were allotted in a completely randomized block design, within a 4 × 2 factorial arrangement (four digestible lysine levels: 0.80, 0.90, 1.00, 1.10%, and two genetic lines), with six replicates and two pigs per experimental unit. There was no interaction between genetic and digestible lysine levels. The digestible lysine levels also did not influence performance or carcass traits of pigs; however, average daily lysine intake increased with increasing digestible lysine level in the experimental diets. Pigs from genetic line B had better carcass traits when compared with those from genetic line A. The level of 0.80% digestible lysine corresponding to a daily intake of 16.60 g digestible lysine meets the nutritional requirement of pigs from both genetic lines evaluated, from 63 to 103 days of age.

Foram utilizados 72 leitões, 36 machos castrados e 36 fêmeas, com peso inicial de 14,97 ± 0,36 kg para avaliar níveis de fósforo disponível (Pd). Os animais foram distribuídos em delineamento experimental de blocos ao acaso, com seis níveis de Pd (0,107; 0,214; 0,321; 0,428; 0,535 e 0,642%), seis repetições e dois animais (um macho castrado e uma fêmea) por unidade experimental. A temperatura interna da sala foi mantida em 24,5 ± 1,2ºC e a umidade relativa do ar em 76,3 ± 8,5%. Os níveis de Pd influenciaram o consumo de ração diário e o ganho de peso diário, que aumentaram de forma quadrática até os níveis estimados de 0,420 e 0,443%, respectivamente, e a conversão alimentar, que melhorou de forma quadrática até o nível estimado de 0,461%. Verificou-se efeito dos níveis de Pd sobre a quantidade de fósforo e cinzas no osso, que aumentou de forma quadrática até os níveis estimados, respectivos, de 0,525 e 0,520%. Os níveis de Pd melhoraram a deposição diária de proteína na carcaça, que aumentou de forma quadrática até o nível estimado de 0,394%, e não afetaram a deposição diária de gordura na carcaça. Os níveis de Pd que proporcionam os melhores resultados de ganho de peso, conversão alimentar e mineralização óssea de suínos de alto potencial genético para deposição de carne magra mantidos em ambiente termoneutro na fase dos 15 aos 30 kg são respectivamente 0,443; 0,461 e 0,525%, que correspondem a consumos diários estimados de 5,25; 5,45 e 6,14 g de fósforo disponível. It was used 72 pigs, 36 castrated males and 36 females, with initial weight of 14.97 ± 0.36 kg to evaluate levels of dietary available phosphorus (aP). The animals were distributed in a completely randomized block design, with six levels of aP (0.107; 0.214; 0.321; 0.428; 0.535 and 0.642%), six replicates and two animals (one castrated male and one female) per experimental unit. Air temperature and relative humidity in the room were kept at 24.5 ± 1.2°C and 76.3 ± 8.5%, respectively. The levels of aP influenced both daily feed intake and daily weight gain, which increased in a quadratic way up to the estimated levels of 0.420% and 0.443%, respectively and feed conversion, which improved in a quadratic manner up to the estimated level of 0.461%. It was observed the effects of levels of aP on quantity of phosphorus and ash in the bone, which increased in a quadratic manner up to the estimated levels of 0.525% and 0.520%, respectively. Levels of Ap affected daily protein deposition in the carcass, which increased in a quadratic way up to the estimated level of 0.394%. There was no effect of levels of aP on daily fat carcass deposition. Levels of aP that provided the best results for daily weight gain, feed conversion and bone mineralization in swines with high genetic potential for lean meat kept in thermoneutral environment, from 15 to 30 kg are 0.443, 0.461 and 0.525%, respectively, corresponding to estimated daily intakes of 5.25, 5.45 and 6.14 g of aP.

Objetivou-se, neste trabalho, avaliar a composição física da carcaça, as características da carne e a proporção dos não-componentes da carcaça do peso vivo de cordeiros abatidos aos 28 kg submetidos a diferentes sistemas alimentares. Dezoito cordeiros (Ile de France x Texel ) foram distribuídos aleatoriamente, com as respectivas mães, em três tratamentos: PCA - pastagem cultivada de azevém (Lolium multiflorum Lam.), CON - confinamento sem alimentação privativa e CCF - confinamento com alimentação privativa para os cordeiros. A alimentação privativa foi oferecida aos cordeiros pelo sistema de creep feeding. Não houve diferença para o percentual do pescoço entre PCA, CON e CCF, com valores de 9,27; 9,17 e 8,72%, respectivamente. Para o percentual de perna, os animais da CON (34,02%) e CCF (34,17%) apresentaram valores semelhantes entre si e superiores aos da PCA (31,73%). A maciez medida na porção do Longissimus dorsi entre a 9ª e 12ª costelas foi semelhante entre os animais dos três tratamentos, de 2,33; 3,03 e 3,08 para PCA, CON e CCF, respectivamente. Não houve efeito dos tratamentos sobre a palatabilidade e suculência da carne. O percentual de pele dos animais da PCA (11,05%) e do CON (10,50%) foram semelhantes entre si, enquanto o PCA apresentou valores mais elevados que o percentual dos animais do CCF (9,70%). Para o percentual do conteúdo gástrico, os valores observados para os animais do CCF (11,47%) foram superiores àqueles da PCA (5,09%) e semelhantes aos obtidos para os animais do CON (8,72%). This study aimed to evaluate carcass physical comp0sition, meat characteristics and live weight carcass no component of lambs slaughter at 28 kg under different feeding systems. Eighteen lambs (Ile de France X Texel) were randomly allotted, with their respective mothers, to three treatments: RP - ryegrass pasture (Lolium multiflorum Lam.), COM - confinament of lamb and sheep together and CCF - confinament with creep feeding. A private feeding by creep feeding system was offered for the lambs. There were no difference in the neck percentage among RP, COM and CCf, with values of 9.27, 9.17, and 8.72%, respectively. In relation to the legs, COM (34.02%) and CCF (34.17%) animals expressed similar values and were superior than RP(31.73) animals values. The softness measured in the loin portion (Longissimus dorsi), from 9th to 12th rib was the same in the animals submitted to three treatments: RP, COM and CCF, with respective values of 2.33, 3.03 and 3.08. There were not effects in the treatments according to juiceness (SUC) and taste (TASTE). The skin percentage of RP (11.05%) and COM (10.50%) were no treatment effects to the through the panel, palatability and juiceness. The skin percentages of RP (11.05%) and CON (10.50%) animals were similar, and RP showed higher values than CCF (9.70%). The values of gastric content percentage for CCF (11.47%) animals were higher than the RP animals (5.09%) and showed similar value for CON (8.72%).