REALIMENTATION OF CULL BEEF COWS. I. LIVE PERFORMANCE, CARCASS TRAITS AND MUSCLE CHARACTERISTICS

Journal of Muscle Foods Pub Date : 2009-06-22 DOI:10.1111/j.1745-4573.2009.00149.x

S.F. HOLMER, J.W. HOMM, L.L. BERGER, M.S. BREWER, F.K. MCKEITH, J. KILLEFER

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引用次数: 13

Abstract

ABSTRACT

The objective of this study was to determine whether culled beef cows fed a high-concentrate diet (FED) would have improved live performance, carcass traits and muscle characteristics compared with forage fed (CON) cows. In addition, ractopamine (RAC) supplementation was evaluated for added benefits over high concentrate alone. Live weight, average daily gain, hot carcass weight, ribeye area, marbling, quality grade and carcass fat measurements increased (P ≤ 0.05) by realimentation. As a percent of hot carcass weight, muscle yields did not differ (P > 0.05). Lipid content increased (P ≤ 0.05) in 5 out of the 10 muscles from FED cows. Cows fed ractopamine showed some numeric improvements over feeding alone, but few statistical differences (P > 0.05). This may result from variability associated with cull cows, and warrants investigation into the best dose/duration for ractopamine. However, realimentation by itself was able to improve cull cow quality.

PRACTICAL APPLICATION

The U.S. beef industry continues to explore new avenues to enhance undervalued sectors of the production system. Through realimentation, cull cow quality can be improved. The data presented herein demonstrate that feeding a high-concentrate diet to cull cows increases both live and carcass weights. In addition, high concentrate-fed cull cows display more marbling and whiter fat cover than those fed at maintenance level. Qualification for premium programs, heavier weights and overall higher quality may lead to increased value for this underutilized sector of the beef industry.

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淘汰肉牛的实现。1 .活产性能、胴体性状和肌肉特性

摘要本试验旨在确定饲喂高精料日粮(fed)的屠宰肉牛是否比饲喂粗料日粮(CON)的肉牛具有更好的活产性能、胴体性状和肌肉特征。此外，还评估了莱克多巴胺(ractopamine, RAC)的补充是否比单独的高浓缩物有更多的益处。活重、平均日增重、热胴体重、肋眼面积、大理石纹、品质等级和胴体脂肪测量值均显著提高(P≤0.05)。以热胴体重的百分比计算，肌肉产量无显著差异(P > 0.05)。饲粮奶牛10块肌肉中有5块肌肉脂肪含量升高(P≤0.05)。与单独饲喂莱克多巴胺相比，饲喂莱克多巴胺的奶牛在数值上有所改善，但统计学差异不大(P > 0.05)。这可能是由于与淘汰奶牛相关的变异性造成的，需要对莱克多巴胺的最佳剂量/持续时间进行调查。然而，实现本身能够提高精选牛的质量。美国牛肉产业继续探索新的途径，以加强生产系统中被低估的部门。通过实施，可以提高奶牛的品质。本文提供的数据表明，饲喂高精料日粮可提高奶牛的活重和胴体重。此外，高精料饲喂的扑杀牛比维持水平饲喂的扑杀牛具有更多的大理石花纹和更白的脂肪盖。优质项目的资格，更重的重量和整体更高的质量可能会增加牛肉行业这一未充分利用的部门的价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Muscle Foods 工程技术-食品科技

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