Performance and carcass characteristics of lambs fed diets with fat and vitamin E

Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG)Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)This experiment aimed to determine the influence of diets with inclusion of protected fat and vitamin E on performance, yield and carcass characteristics of feedlot lambs with different weights. Thirty-two non-castrated Santa Ines lambs were fed diets with a ratio of 40% forage and 60% concentrate ad libitum, with presence or absence of protected fat and/or vitamin E, in a total of four diets. Two weights of early containment were also considered: between 20 and 25 kg and between 30 and 35 kg. All animals were slaughtered at 84 days of confinement. Animals fed diets without addition of protected fat, regardless of the use of vitamin E, had the highest intakes of dry matter, crude protein, neutral detergent fiber and ash, and decreased intake of ether extract. The variables investigated did not affect daily weight gain and total gain. Feed conversion was better for the lighter confined animals not fed protected fat. The heavier feedlot lambs fed diets with vitamin E showed higher cold carcass. The warm carcass for the lighter animals confined fed with vitamin E, and the heavier ones, fed with protected fat and vitamin E, showed the best yields of cold carcass. Objective measures of the carcass cold had the highest mean for heavier feedlot lambs. The addition of fat in the diet reduces the intake of dry matter and increases the ether extract. Although the inclusion of vitamin has no effect on intake of nutrients, it protects the carcasses from losses during cooling, and weight differences at containment directly reflect the measures of the carcasses

Performance, carcass characteristics and non-carcass components of Texel ? Santa In?s lambs fed fat sources and monensin

Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG)Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)Performance, carcass, non-carcass and commercial cuts and components of Texel ? Santa In?s crossbred lambs, managed in confinement and fed diets based on soybean oil, soybeans and a conventional diet, with or without the use of monensin (78 ppm dry matter basis) were evaluated. Thirty-six Texel ? Santa In?s lambs (18 males and 18 females) were managed in intensive systems. Animals were slaughtered after 87 days of confinement, and performance, carcass characteristics, weight and percentages of carcass and non-carcass components were evaluated. The animals fed the control diet had heavier carcass and parts than animals fed soybean, while the oil diet did not differ from the controls in most parameters. The animals fed soybean showed lower intake kg dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF) and metabolizable energy (ME) compared with animals fed the control diet, increased ether extract (EE) intake in kg, % body weight (BW) and metabolic weight (MW) and did not differ from the soybean oil diet. Animals receiving monensin had lower DM intake, OM, CP, EE, NDF, gross energy (GE) regardless of the expression, % kg BW, or % PM, than the animals that did not receive the additive. Males produced better and had heavier cuts than the females; the latter deposited subcutaneous fat earlier. Animals that received oil or soybean showed greater body weight and small intestine percentage. Soybean oil intake did not improve performance, carcass weights or parts of Santa Ines ? Texel lambs in confinement. Soybeans at 15% dry matter reduced energy intake and lamb performance. The use of monensin at 78 ppm on a dry matter basis is not recommended for lambs in confinement, especially if associated with oil or soybeans that may harm animal performance

Componentes de carcaça e composição de alguns cortes de cordeiros Texel x Bergamácia, Texel x Santa Inês e Santa Inês puros, terminados em confinamento, com casca de café como parte da dieta

Trinta e seis cordeiros, 12 cruzas Texel x Bergamácia (TB), 12 cruzas Texel x Santa Inês (TS) e 12 puros Santa Inês (SI), foram confinados individualmente, por um período de 50 dias. Cada grupo genético consistiu de seis machos inteiros e seis fêmeas, recebendo três diferentes dietas experimentais: 1 = sem casca de café (dieta controle); 2 = com casca de café in natura; e 3 = com casca de café tratada com uréia e grão de soja moído. Os animais foram abatidos com idade média de 180 dias; posteriormente, foram avaliados os cortes da carcaça fria e a composição em músculo, osso e gordura da perna, paleta e do lombo. Para os outros cortes da carcaça e composição da perna, paleta e lombo, a utilização da casca de café, tratada ou não, não afetou os pesos. Os cordeiros SI mostraram menor peso para o músculo da perna e do lombo. O grupo genético não influenciou significativamente os pesos dos outros componentes, somente a paleta apresentou significância, indicando ser mais pesada para os animais TB e TS. Os machos apresentaram pesos maiores para braço posterior e anterior, pesos dos músculos da paleta, perna e lombo, e ainda, pesos maiores dos ossos da paleta e do lombo