Department of Animal Science, Oklahoma State University, Stillwater 74078, USA.
J Anim Sci. 2010 May;88(5):1817-22. doi: 10.2527/jas.2009-2386. Epub 2010 Feb 26.
Beef steers (n = 11,877) from 7 studies were fed zilpaterol hydrochloride (ZH) for 0 or 20 to 40 d before slaughter to determine the effects of ZH on subprimal weight and yield. Carcasses were selected based on mean HCW of treatment groups for fabrication into boneless, closely trimmed, or denuded subprimals, lean, fat, and bone. Data from the 7 trials were pooled for statistical analysis. Feeding ZH increased (P < 0.05) weights of all major subprimals compared with steers not supplemented with ZH. Also, subprimals from the hindquarter, including valuable cuts like the tenderloin, strip loin, and top sirloin butt, increased (P < 0.05) as a percentage of cold carcass weight from steers fed ZH. The tenderloin was 0.06 percentage units greater (P < 0.05), the strip loin was 0.08 percentage units greater (P < 0.05), and the top sirloin butt was 0.11 percentage units greater (P < 0.05) in ZH-fed steers when compared with steers not fed ZH. Supplementation of ZH greatly increased (P < 0.05) total saleable carcass yield by 1.76 percentage units, whereas ZH inclusion decreased (P < 0.05) the percentage of fat trim and bone by 0.58 and 1.10 percentage units, respectively. Therefore, ZH can be utilized by the beef industry to improve red meat yield efficiency throughout the beef production chain.
从 7 项研究中选取了 11877 头肉牛，在屠宰前用齐帕特罗盐酸盐（ZH）进行 0 至 20 至 40 天的喂养，以确定 ZH 对次优体重和产量的影响。胴体是根据处理组的平均 HCW 选择的，用于制作无骨、紧密修剪或裸露的次优产品、瘦肉、脂肪和骨骼。对 7 项试验的数据进行了汇总分析。与未补充 ZH 的肉牛相比，饲喂 ZH 增加了所有主要次优产品的重量（P<0.05）。此外，来自后躯的次优产品，包括有价值的切口，如里脊、里脊和上臀肉，从饲喂 ZH 的肉牛的冷胴体重量中增加（P<0.05）。与未饲喂 ZH 的肉牛相比，饲喂 ZH 的肉牛的里脊增加了 0.06 个百分点（P<0.05），里脊增加了 0.08 个百分点（P<0.05），上臀肉增加了 0.11 个百分点（P<0.05）。ZH 的补充大大增加了（P<0.05）可销售的胴体总产量 1.76 个百分点，而 ZH 的包含物分别减少了（P<0.05）0.58 和 1.10 个百分点的脂肪修剪和骨骼。因此，牛肉行业可以利用 ZH 提高整个牛肉生产链的红肉产量效率。
