-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.Key Words: genotype, minerals, requirement, swine, temperature Níveis de fósforo disponível em rações para suínos de alto potencial genético para deposição de carne magra mantidos em ambiente termoneutro dos 15 aos 30 kg RESUMO -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...

RESUMO -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%).Palavras-chave: confinamento, pastagem de azevém, maciez, palatabilidade, suculência Evaluation of Carcass Cuttings Proportion, Meat Characteristics and Evaluation of Live Weight Components of LambsABSTRACT -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 9 th to 12 th 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...

-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.

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 < 0.001) average daily feed i ntake at both growth phases. At 24°C, pigs in phase 1 fed the 0.321% aP diet had greater average daily gain and feed conversion (P < 0.05) than those fed the 0.107% or 0.535% while, at 34°C pigs fed the 0.535% aP had the best performance (P < 0.05). Pigs from phase 2 fed the 0.306% aP had best performance in both thermal environments. Gene expression profile was analyzed by quantitative real-time polymerase chain reaction. Irrespective of growing phase, the expression of six genes was lower (P < 0.05) at high temperature than at thermoneutrality. The lower expression of these genes under high temperatures evidences the effects of heat stress by decreasing oxidative metabolism, through adaptive physiological mechanisms in order to reduce heat production. In pigs from phase 1, six genes were differentially expressed across aP levels (P < 0.05) in the thermoneutral and one gene in the heat stress. In pigs from phase 2, two genes were differentially expressed across aP levels (P < 0.05) in both thermal environments. These data revealed strong evidence that phosphorus and thermal environments are key factors to regulate oxidative phosphorylation with direct implications on animal performance.Keywords: nutrigenomics, oxidative phosphorylation, pig production, heat stress and animal production, phosphorous levels for pig nutrition ImplicationsData from this study are the first to reveal the effects of different available phosphorus (P) levels in Longissimus dorsi gene expression related to oxidative phosphorylation and its implications on pig performance. Moreover, this study showed the effects of high temperatures on the expression of these genes and how this may alter the physiological response to P. This information will contribute to better understand the role of P in energy metabolism and will bring new insights into the comprehension of the effects of high temperatures on nutritional requirements and mitochondrial function.

RESUMOAvaliou-se o efeito da inclusão de níveis de triticale sobre o valor nutritivo de dietas para suínos com ou sem enzimas. Foram utilizados 24 suínos machos, castrados, com peso inicial de 59kg, alojados em gaiolas metabólicas. O delineamento foi de blocos ao acaso em arranjo fatorial 3 x 2 (níveis de triticale, 0, 30 e 60%, com ou sem enzimas), com quatro repetições cada. A inclusão de triticale na dieta em até 60% e a adição de enzimas não influenciou (P>0,05) a digestibilidade da matéria seca, fósforo, energia bruta, metabolização da energia, energia digestível e metabolizável e o balanço do N. Os valores médios de energia digestível e metabolizável foram de 3.537 e 3.435kcal. Houve interação triticale x enzimas na proteína digestível aparente (PD a ) (P<0,01). Na dieta com 60% de triticale sem adição de enzimas a PD a foi 6% inferior à controle. Na dieta com 30 e 60% de triticale com enzimas, a PD a foi similar à controle e 5% superior à dieta com 60% de triticale sem enzimas. A inclusão de 60% de triticale em dietas para suínos reduz a PD a . A adição de enzimas melhora a PD a em dietas com 30 e 60% de triticale.Palavras-chave: suíno, β-glucanase, fósforo, metabolizibilidade, nitrogênio, xilanase O Rio Grande do Sul é um dos estados mais importantes na produção nacional de grãos. A localização geográfica do RS apresenta condições de clima e solo favoráveis à produção ABSTRACT