Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho, SP 14.160-970, Brazil.
Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho, SP 14.160-970, Brazil.
Meat Sci. 2017 Jun;128:34-39. doi: 10.1016/j.meatsci.2017.02.004. Epub 2017 Feb 6.
A total of 127 Nellore bulls classified as low and high residual feed intake (RFI), from three selection lines, were evaluated in five experiments aiming to identify associations between RFI, carcass, and meat quality traits. Feedlot performance, carcass traits, and meat quality of Longissimus muscle were evaluated. A mixed model including the fixed effects of RFI class, selection line, interaction between RFI class and selection line, and age at slaughter as a covariate, and the random effects of diet within experiment and experiment was used, with means compared by the t-test. Feed intake average difference was 0.962kg/day; low RFI animals consumed 0.479kg/day less feed and high RFI animals consumed 0.483kg/day more feed than expected. No differences between RFI classes were detected for most of studied variables, demonstrating the absence of unfavorable associations between RFI and carcass and meat quality traits. Low RFI Nellore animals use feed efficiently and produce good quality carcasses and meat.
共有 127 头Nellore 公牛，根据低和高残留饲料摄入量（RFI）进行分类，来自三个选择品系，在五个实验中进行了评估，旨在确定 RFI、胴体和肉质性状之间的关联。评估了肥育性能、胴体性状和肌肉品质。采用包含 RFI 类、选择品系、RFI 类与选择品系之间的相互作用以及屠宰时年龄作为协变量的混合模型，以及实验内和实验间饮食的随机效应，通过 t 检验比较平均值。饲料摄入量平均差异为 0.962kg/天；低 RFI 动物每天少吃 0.479kg 饲料，高 RFI 动物每天多吃 0.483kg 饲料。大多数研究变量在 RFI 类别之间没有差异，表明 RFI 与胴体和肉质性状之间没有不利关联。低 RFI Nellore 动物饲料利用率高，生产出优质的胴体和肉。
