Department of Animal Sciences, Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Campus Jaboticabal, CEP: 14884-900, Jaboticabal-SP, Brazil.
Meat Sci. 2012 Mar;90(3):770-4. doi: 10.1016/j.meatsci.2011.11.012. Epub 2011 Nov 11.
Carcass and meat quality traits of thirty-six feedlot beef heifers from different genetic groups (GG) fed at two concentrate levels (CL) were evaluated using 12 - Nellore (NE), 12 - ½Angus x ½Nellore (AN) and 12 - ½Simmental x ½Nellore (SN) animals. Six heifers of each GG were randomly assigned into one of two treatments: concentrate at 0.8% or 1.2% of body weight (BW). Heifers fed concentrate at 0.8% of BW had greater (P<0.05) dressing percentage. None of the proximate analysis components of the beef were affected (P>0.05) by either CL or GG. Heifers from the AN group had higher (P<0.05) carcass weights, 12th rib fat thickness and lower dressing percentage (P<0.05) compared to the other groups. NE heifers had greater WBSF values (P<0.05) than the other genetic groups. Data suggest that the concentrate level can be reduced without compromising meat quality traits.
采用 12 头尼洛拉（NE）、12 头安格斯半血×尼洛拉（AN）和 12 头西门塔尔半血×尼洛拉（SN）牛，对来自不同遗传群体（GG）的 36 头育肥牛的胴体和肉质特性进行了评估，这些牛分为两个精饲料水平（CL）进行饲养。每组 6 头，随机分配到以下两种处理方式之一：精饲料占体重的 0.8%或 1.2%。精饲料占体重 0.8%的牛具有更高的（P<0.05）出肉率。牛肉的任何一种近似分析成分均不受（P>0.05）CL 或 GG 的影响。与其他群体相比，AN 组的牛具有更高的（P<0.05）胴体重、第 12 肋骨脂肪厚度和更低的出肉率（P<0.05）。NE 牛的 WBSF 值更高（P<0.05），比其他遗传群体。数据表明，在不影响肉质特性的情况下，可以降低精饲料水平。
