Effects of birth type and family on the variation of carcass and meat traits in Santa Ines sheep.

This study aimed to evaluate the effects of birth type and family on quantitative and qualitative meat traits in Santa Ines lambs and to do a descriptive study of variation inside of breed. A total of 50 carcass and meat traits were evaluated in up to 101 lambs slaughtered at 424 days of age. Random effect of family, the fixed effect of birth type (single or double) and year, and the covariates of dam's weight at weaning and age (in days) at slaughter were inserted in the model. This study shows that some carcass and meat traits in Santa Ines raised on pasture has large variability, specially for meat cut yields, several carcass non-components yields, and rib eye area, subcutaneous fat thickness, shear force, cooking losses, and b* color parameter. The birth type effect influenced (P < 0.05) rump width; reticulum, leg, heart and kidney yields; and the carcass pH at 24 h after slaughter. The family effect was significant (P < 0.05) for cold carcass weight; hot, cold and true carcass yields; external carcass and leg lengths; perimeter and width of the rump; kidney, liver and tail yields; and carcass pH at slaughter.

Performance of the Santa Ines breed raised on pasture in semiarid tropical regions and factors that explain trait variation.

This study aimed to evaluate sex, the number of lambs per birth, and the family effects on production traits in the Santa Ines breed of sheep by estimating the least square means and coefficient of variance for those traits. A total of 484 lambs were evaluated for the following traits: weight at birth, at weaning, and at 240 days of age; weight gain during the pre-weaning and post-weaning periods; height, width, and length of different body regions; and rib eye area and fat thickness between the 12th and 13th ribs. We observed coefficients of variation higher than 10 % for several traits. Generally, males were larger than females (P < 0.05), while lambs from single and double births were larger than lambs from triple births (P < 0.05). Family effect was significant (P < 0.05) for most traits and explained the highest percentage of residual variance. The results showed good development of Santa Ines sheep, especially during the pre-weaning period but no in post-weaning. Our study also showed that there is an effect of sex, birth type, and family, which must be included in any statistical model for the estimation of least square means and residual variance in ANOVA.

Produção de forragem e desempenho animal em pastagens de coastcross consorciada ou não com Arachis pintoi, com e sem nitrogênio / Forage Production and Performance Animal in CoastcrossIntercropping or not with Arachis pintoi, with or without Nitrogen

O estudo objetivou avaliar a produção de forragem e desempenho animal empastagens de Coastcross + Arachis pintoi; Coastcross + Arachis pintoi com 100 kg ha-1 de N;Coastcross + Arachis pintoi com 200 kg ha-1 de N e Coastcross com 200 kg ha-1 de N, nasestações de inverno, primavera, verão e outono. Utilizou-se o delineamento experimentalem blocos ao acaso, com os tratamentos em parcelas subdivididas, com duas repetições. Foram avaliados: acúmulo de massa de forragem e acúmulo diário de massa de forragem,ganho médio diário (GMD), ganho de peso vivo por área e taxa de lotação. A utilização de Coastcross + 200 kg ha-1 de N e as melhores condições climáticas na primavera e verão favoreceram tanto o acúmulo de massa de forragem (26.764 kg ha-1 de MS) quanto o acúmulo diário de massa de forragem (82 kg ha-1 por dia de MS). A utilização da associação entre Arachis pintoi + 200 kg ha-1 de N e Coastcross + 200 kg ha-1 de N, possibilitou o melhor desempenho animal, com GMD de 0,570 e 0,500 kg e taxa de lotação de 3,51 e 3,26UA ha-1, respectivamente. A utilização de pastagem consorciada sem a associação com doses de nitrogênio (100 e 200 kg ha-1) não favoreceu (p > 0,05) o acúmulo de massa de forragem e a taxa de acúmulo diária. A utilização de 200 kg ha-1 de N, com e sem a leguminosa, proporcionou o melhor desempenho e lotação animal por área.

The objective of this study was to evaluate dry matter production and animal performance in pastures of Coastcross + Arachis pintoi; Coastcross + Arachis pintoi with 100 kg ha-1 of N; Coastcross + Arachis pintoi with 200 kg ha-1 of N and Coastcross with 200 kg ha-1 of N, during winter, spring, summer and autumn. The experimental design was complete randomized blocks with split-plot parcels, with two repetitions. The study evaluated the accumulation of forage mass and dairy accumulation of forage mass, average daily gain (ADG), live weight gain and stocking rate. The used of Coastcross + 200 kg ha-1 of N and the best climatic conditions in the spring and summer, favored the accumulation of forage mass (26,764 kg ha-1 of DM) and daily accumulation of forage mass (82 kg ha-1 day-1 of DM). The use of the association between Arachis pintoi + 200 kg ha-1 of N and Coastcross + 200 kg ha-1 of N, produces best animal performance, with ADG of 0.570 and 0.500 kg and stocking rate of 3,51 and 3.26 AU ha-1, respectively. The use of pasture intercropping without association with doses of nitrogen (100 and 200 kg ha-1) did not favor (p > 0.05) the accumulation of forage mass and dairy accumulation of forage mass. The utlization of 200 kg ha-1 of N, with and without the legume, favored greater animal performance and stocking rate.

Produção de forragem e desempenho animal em pastagens de coastcross consorciada ou não com Arachis pintoi, com e sem nitrogênio / Forage Production and Performance Animal in CoastcrossIntercropping or not with Arachis pintoi, with or without Nitrogen

O estudo objetivou avaliar a produção de forragem e desempenho animal empastagens de Coastcross + Arachis pintoi; Coastcross + Arachis pintoi com 100 kg ha-1 de N;Coastcross + Arachis pintoi com 200 kg ha-1 de N e Coastcross com 200 kg ha-1 de N, nasestações de inverno, primavera, verão e outono. Utilizou-se o delineamento experimentalem blocos ao acaso, com os tratamentos em parcelas subdivididas, com duas repetições. Foram avaliados: acúmulo de massa de forragem e acúmulo diário de massa de forragem,ganho médio diário (GMD), ganho de peso vivo por área e taxa de lotação. A utilização de Coastcross + 200 kg ha-1 de N e as melhores condições climáticas na primavera e verão favoreceram tanto o acúmulo de massa de forragem (26.764 kg ha-1 de MS) quanto o acúmulo diário de massa de forragem (82 kg ha-1 por dia de MS). A utilização da associação entre Arachis pintoi + 200 kg ha-1 de N e Coastcross + 200 kg ha-1 de N, possibilitou o melhor desempenho animal, com GMD de 0,570 e 0,500 kg e taxa de lotação de 3,51 e 3,26UA ha-1, respectivamente. A utilização de pastagem consorciada sem a associação com doses de nitrogênio (100 e 200 kg ha-1) não favoreceu (p > 0,05) o acúmulo de massa de forragem e a taxa de acúmulo diária. A utilização de 200 kg ha-1 de N, com e sem a leguminosa, proporcionou o melhor desempenho e lotação animal por área.(AU)

The objective of this study was to evaluate dry matter production and animal performance in pastures of Coastcross + Arachis pintoi; Coastcross + Arachis pintoi with 100 kg ha-1 of N; Coastcross + Arachis pintoi with 200 kg ha-1 of N and Coastcross with 200 kg ha-1 of N, during winter, spring, summer and autumn. The experimental design was complete randomized blocks with split-plot parcels, with two repetitions. The study evaluated the accumulation of forage mass and dairy accumulation of forage mass, average daily gain (ADG), live weight gain and stocking rate. The used of Coastcross + 200 kg ha-1 of N and the best climatic conditions in the spring and summer, favored the accumulation of forage mass (26,764 kg ha-1 of DM) and daily accumulation of forage mass (82 kg ha-1 day-1 of DM). The use of the association between Arachis pintoi + 200 kg ha-1 of N and Coastcross + 200 kg ha-1 of N, produces best animal performance, with ADG of 0.570 and 0.500 kg and stocking rate of 3,51 and 3.26 AU ha-1, respectively. The use of pasture intercropping without association with doses of nitrogen (100 and 200 kg ha-1) did not favor (p > 0.05) the accumulation of forage mass and dairy accumulation of forage mass. The utlization of 200 kg ha-1 of N, with and without the legume, favored greater animal performance and stocking rate.(AU)