断奶后生长速度对内洛尔牛胴体性状和肉质的影响。
Effect of post-weaning growth rate on carcass traits and meat quality of Nellore cattle.
作者信息
Silva Luiz H P, Paulino Pedro V R, Assis Gutierrez J F, Assis Debora E F, Estrada Mauricio M, Silva Matheus C, Silva Jaqueline C, Martins Taiane S, Valadares Filho Sebastião C, Paulino Mário F, Chizzotti Mario L
机构信息
Department of Animal Science, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
Cargill Animal Nutrition/Nutron, Campinas, São Paulo, Brazil.
出版信息
Meat Sci. 2017 Jan;123:192-197. doi: 10.1016/j.meatsci.2016.10.005. Epub 2016 Oct 12.
This study evaluated the effects of growth rate during post-weaning growing phase on carcass traits and beef quality. Thirty-four Nellore young bulls were randomly assigned to one of three treatments: LOW, MEDIUM or HIGH growth rate during post-weaning growing phase followed by high growth rate in the finishing phase. The growth rate affected (P<0.05) all carcass traits evaluated at the end of post-weaning growing phase, except ultimate pH. Carcass dressing was greatest (P<0.05) for the HIGH growth rate group in both phases. Beef from the HIGH group exhibited the greatest (P<0.05) sarcomere length and a* and b* colour values at the end of post-weaning growing phase. However, post-weaning growth rate did not affected (P>0.05) collagen content and solubility, myofibrillar fragmentation index and Warner-Bratzler shear force. Our data suggest that a low post-weaning growth rate produces lighter and leaner carcasses, but it does not affect meat quality traits in Nellore young bulls.
本研究评估了断奶后生长阶段的生长速度对胴体性状和牛肉品质的影响。34头内洛尔青年公牛被随机分配到三种处理之一：断奶后生长阶段生长速度低、中或高，育肥阶段生长速度高。生长速度影响（P<0.05）断奶后生长阶段结束时评估的所有胴体性状，但最终pH值除外。两个阶段中，高生长速度组的胴体屠宰率最高（P<0.05）。断奶后生长阶段结束时，高生长速度组的牛肉肌节长度以及a和b颜色值最大（P<0.05）。然而，断奶后生长速度对胶原蛋白含量和溶解度、肌原纤维破碎指数和沃纳-布拉茨勒剪切力没有影响（P>0.05）。我们的数据表明，断奶后生长速度低会使胴体更轻且更瘦，但不会影响内洛尔青年公牛的肉质性状。
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