摘要
Residual feed intake (RFI) is the difference between measured feed intake and predicted feed intake of an animal. Intake prediction is computed from a regression of intake on gain and metabolic body weight. Residual feed intake is used as a measure of metabolic efficiency. As RFI increases, feed intake (FI) and feed conversion ratio (FCR) increase with no change in postweaning growth and body weight in steers. Identification and selection for lower RFI cattle would improve herd feed efficiency without influencing growth. Steer residual feed intake measured in the growing phase, is related to residual feed intake during the finishing phase. Animals with low residual feed intake in the growing phase had lower residual feed intake and improved feed efficiency in the finishing phase. Serum concentrations of glucose and mitochondrial function are related to metabolic efficiency and may differ between residual feed intake phenotypes. Serum concentrations of glucose at weaning were greater ( P P P P P longissimus dorsi muscle area in steers during the finishing phase.
摘要译文
残余饵料摄入（RFI）是测得的采食量和动物的预测采食量之间的差异。进预测，从摄入的增益和代谢体重计算的回归。残余饵料摄取被用作代谢效率的量度。如射频干扰增加时，饲料摄取量（FI）和饲料转化率（FCR）增加与在阉牛断奶后生长和体重没有变化。较低的RFI牛识别和选择将提高猪群饲料转化效率不影响生长。转向在成长阶段测得的剩余采食量，是在整理阶段涉及到剩余的采食量。动物，低残留采食量在不断增长的阶段有较低的残余采食量和育肥阶段饲料提高效率。血清浓度的葡萄糖和线粒体功能相关的代谢效率和残余饲料摄取量的表型之间可能不同。在整理阶段断奶血清浓度葡萄糖均大于（PPPPP背最长肌面积公牛。
Davis, Michael Patrick. Influence of diet, production traits, blood hormones and metabolites, and mitochondrial complex protein concentrations on residual feed intake in beef cattle[D]. US: University of Missouri - Columbia, 2009