Postweaning growth of the non-carcass components of Texel crossbred lambs

Abstract

-Twenty 11/16 Texel × 5/16 Ile de France crossbred lambs were slaughtered at different body weights to evaluate the growth of their non-carcass components. Animals were weaned at 42 days of age (15.9 ± 2.1 kg of body weight), housed in individual stalls, and fed ad libitum. After ten days of an experimental adaptation period, 5 lambs were slaughtered. The remaining lambs were randomly assigned to one of three following slaughter weights: 25, 30 or 35 kg of body weight at fast. At slaughter, all body components were individually weighed and expressed as percentage of the empty body weight. To determine allometric growth of individual components, the exponential equation Y = aX b was logarithmically transformed and used. Proportions of feet and head decreased, while wool proportion increased linearly as slaughter weight increased. Greater fat deposition in viscera (kidney and mesenteric fat) was observed for lambs slaughtered at more elevated body weights. Growth rate of small intestine was lower than that of the empty body (b = 0.39), and it decreased linearly as a proportion of empty body weight with advancing maturity. Growth rates of both liver and large intestine were isogonics (b = 0.90 and 1.08, respectively), i.e., similar to the empty body weight. On the other hand, rumen presented late growth (b = 1.37), and its proportion was lower only for the lambs slaughtered at weaning (1.58% of EBW). Once increased slaughter weights result in higher deposition of nutrients on body parts that are not intended to consumption, maximum slaughter weight of 11/16 Texel × 5/16 Ile de France crossbred lambs is recommended to be at 30 kg of body weight.Key Words: allometry, gastrointestinal tract, intestines, organs, sheep, viscera, Crescimento dos componentes não-integrantes da carcaça de cordeiros mestiços Texel no período pós-desmama RESUMO -Vinte cordeiros 11/16 Texel × 5/16 Ile de France foram abatidos em diferentes pesos com o objetivo de avaliar o crescimento dos componentes não-integrantes da carcaça. Os animais foram desmamados aos 42 dias de idade (15,9 ± 2,1 kg de peso corporal) e confinados em baias individuais, recebendo alimentação à vontade. Após um período de 10 dias de adaptação às condições experimentais, 5 cordeiros foram abatidos e os remanescentes foram aleatoriamente sorteados para serem abatidos aos 25, 30 ou 35 kg de peso corporal em jejum. Ao abate, cada componente corporal foi pesado individualmente, e seus valores expressos em percentual do peso de corpo vazio (PCV). Para determinação do crescimento alométrico de cada componente, foi utilizada a equação exponencial Y = aX b , transformada logaritmicamente em um modelo linear. As proporções de patas e cabeça decresceram, e a de lã aumentou linearmente de acordo com o peso de abate. Observou-se acentuado acúmulo de gordura interna (renal e mesentérica) no corpo dos animais abatidos em pesos mais elevados. A taxa de crescimento do intestino delgado foi menor que a do corpo vazio (b = 0,39) o que reduziu a proporção desse órgão com o avanço d...

Some Gastrointestinal Tract Characteristics of Karayaka Ram Lambs Slaughtered at Different Weights

“…In the present study, the EBW, the weights of GIT and their segments such as stomach and intestine caecum increased at a steady rate between all slaughter weights, as reported by Balci and Karakas [14], Abdullah and Qudsieh [7], and Galvani et al [10]. …”

“…Traditionally, lambs in Turkey as well as in most parts of the world are slaughtered between weaning at approximately 3 to 6 months of age with slaughter weights of 10 to 12 kg for suckling lambs, 20 to 22 kg for light lambs, 30 to 32 kg for early fattening lambs, and 40 to 42 kg for late fattening lambs [7, 8]. As reported by Carvalho et al [9] and Galvani et al [10], proportions of different noncarcass components such as GIT, stomach, and intestine expressed as percentage of the body weight at slaughter and also the proportion of gastrointestinal content are the main factors that affect carcass yield. A high feed efficiency cannot always represent a high efficiency of food production, because some organs can be proportionally greater at more advanced maturity, dropping the retention of tissues in the carcass [11].…”

Proporção e crescimento alométrico dos componentes não carcaça de cordeiros Texel abatidos com diferentes pesos

“…Comparando-se resultados de outros experimentos com os do presente estudo, observa-se que Galvani et al (2010), também encontraram em cordeiros Texel x Ile de France abatidos com 25, 30 e 35 kg de PV diminuição linear da proporção de cabeça e patas. Rosa et al (2005), explicam que o crescimento ósseo ocorre numa fase inicial de desenvolvimento e, portanto, os animais mais jovens apresentam maiores proporções deste tecido.…”

“…Resultados semelhantes foram obtidos por Galvani et al (2010) em relação ao PCV, em que foram considerados tardios os constituintes omaso, rúmen, aparelho reprodutor e gordura renal, enquanto que obtiveram crescimento precoce para pele, patas, cabeça, rins, pulmão, abomaso e intestino delgado. A pele se diferencia, pois esses autores a separaram da lã, enquanto que no presente trabalho foram avaliadas em conjunto.…”

Effects of pearl millet silage ammoniation with urea on carcass and meat quality of lambs

“…The main factors determining carcass qualitative and quantitative traits are sex (Koyuncu, Duru, Uzun, Özis, and Tuncel (), age (Galvani et al., ), genotype (Gomes et al., ), production system (Silva Sobrinho & Silva, ) and diet (Casey & Webb, ). In the present study, the only factor that could lead to a decrease in the slaughter weight and hot and cold carcass weights and yields would be the diet, as the other parameters were not changed with the different treatments.…”