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de Sousa W.H.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Cartaxo F.Q.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Costa R.G.,Federal University of Paraiba | Cezar M.F.,Federal University of Campina Grande | And 3 more authors.
Revista Brasileira de Zootecnia | Year: 2012

The objective of this study was to evaluate performance, carcass dressing and gross profit margin of lambs of different genotypes finished in feedlot with diets containing two levels of energy (2.40 Mcal/kg dry matter - DM or 2.90 Mcal/kg DM). Fifty-four non-castrated lambs of the following genotypes were used: Santa Inês, F1 Dorper × Santa Inês and F1 Santa Inês × undefined breed at approximately 150 d of age averaging 22.6 kg of live body weight. Lambs subjected to the diet containing 2.90 Mcal/kg DM stayed in feedlot for a shorter period of time. Moreover, they showed lower intake of dry matter and water in addition to greater daily weight gain and corporal score. There was interaction of feed conversion, carcass dressing yield and gross profit margin. The Dorper × Santa Inês lambs showed similar feed conversion in the two diets. However, Santa Inês lambs and Santa Inês × undefined breed lambs showed better feed conversion with the diet containing 2.90 Mcal/kg DM. The carcass dressings of the Santa Inês × undefined breed lambs were similar for both diets. Furthermore, the carcass dressing values were higher for the Santa Inês and Dorper × Santa Inês which received the diet with higher energy density. The gross profit margin is higher for Dorper × Santa Inês lambs in relation to genotype Santa Inês × undefined breed lambs when subjected to the diet with 2.40 Mcal/kg DM. © 2012 Sociedade Brasileira de Zootecnia. Source


Costa R.G.,Federal University of Paraiba | Dos Santos N.M.,Agencia Estadual de Vigilancia Sanitaria | Do Egypto Queiroga R.D.C.R.,Federal University of Paraiba | De Sousa W.H.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2015

The objective of this study was to evaluate the chemical composition and fatty acid profile of meat from Santa Inês, Dorper × Santa Inês, and undefined-breed lambs finished in a feedlot system according to two forage:concentrate ratios (50:50 and 20:80) in the diet. Overall, 54 non-castrated animals were used (with an average initial weight of 23±1.5 kg at 150 days old) and were slaughtered when they reached 36 kg of live weight or 63 days of confinement. Diets with high concentrate levels favored meat production with higher protein content. Among the saturated fatty acids, only heptadecanoic (C17:0) and arachidic acids (C20:0) differed among the treatments. The amount of oleic acid detected in the meat ranged from 49.2 to 51.9 g/100 g, making this one the most representative fatty acids. Regardless of the diet and genotype, the unsaturated fatty acid and desirable fatty acid levels in the lamb meat characterize it as of satisfactory quality for the consumer market. Source


Costa R.G.,Federal University of Paraiba | de Lima C.A.C.,Empresa de Pesquisa Agropecuaria Do Rio Grande Do Norte | de Medeiros A.N.,Federal University of Paraiba | Lima G.F.D.C.,Empresa de Pesquisa Agropecuaria Do Rio Grande Do Norte | And 3 more authors.
Revista Brasileira de Zootecnia | Year: 2011

This experiment evaluated carcass traits and yields of comercial cuts and tissue evaluation of 20 Morada Nova lambs fed diets with fruit-refuse of melon replacing 0, 30, 60 or 100% of ground corn. The animals with 15 kg of initial body weight and at 6 six months of age were kept confined in individual pens and slaughtered with 26 kg of weight. It was used a completely randomized experimental design, with four treatments (levels of ground corn replaced by melon fruit-refuse) and five replicates. It was not observed any significant differences for empty body weight, hot and cold carcass weight, yields of hot and cold carcass, and biological yield. Neither it was noted significant effect of inclusion of melon fruit-refuse in the diets on yields of commercial cuts (neck, rib, palette, loin and leg) and concentrations of muscle, bone and fat. Substitution of ground corn by melon fruit-refuse in diets does not harm quantitative traits of carcass of Morada Nova lambs and it is a good alternative for finishing meat sheep feeding. © 2011 Sociedade Brasileira de Zootecnia. Source


Costa R.G.,Federal University of Paraiba | Dos Santos N.M.,Agencia Estadual de Vigilancia Sanitaria | De Sousa W.H.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | de Cassia Ramos Do Egypto Q.R.,Federal University of Paraiba | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2011

The objective of this work was to evaluate sensory atributes (tenderness, odor, flavor, juiciness and color) and physical attributes (shearing force, cooking losses and the color parameters of L*, a*, b*) in addition to content of iron in the meat of Santa Inês (SI), Dorper × Santa Inês (DP × SI) and Without Definite Breed Pattern (WDB) lambs, finished in feedlots, in function of two roughage:concentrate (50:50 and 20:80) relationships in the diet. It was used 54 whole lambs (18 from each genotype, with initial average weight of 23 kg and at 150 days of age) slaughtered at 36 kg of live weight. The fed diets favored differentiation in meat color. Bright intensity (L*) differed among the genetic groups. In animals fed diet with high level of concentrate, the meat presented fewer cooking losses. It was observed the existence of a correlation between the intensity of red (a*) and the color of fresh meat and among dietary iron concentration in the meat and and bright intensity (L*). Meat of SI and SRD lambs is less tough and more juicy than meat of Dorper × Santa Inês. The ratio roughage:concentrate in the diet does not promote changes in sensory attributes and physical parameters of the meat. © 2011 Sociedade Brasileira de Zootecnia. Source

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