Residual Feed Intake as a Measure to Select Genetically Productive Beef Cattle: A Review

T. Valente, A. Cezário, W. D. Santos, Jeferson Corrêa Ribeiro, E. M. B. Oliveira, E. Lima, B. B. Deminicis, Thasia Martins Macedo, Rogério de Carvalho Veloso
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Abstract

Measures such as residual feed intake (RFI) have been increasingly considered to select cattle with superior feed efficiency, as it is a characteristic of feed efficiency calculated as the difference between observed intake and estimated intake considering metabolic weight and the weight gain. Estimated feed intake is obtained through the multiple regression equation of observed consumption on metabolic mean live weight and weight gain. The standard was shared among animals into one herd selected for low RFI (high efficiency) and compared to the one selected for high RFI (low efficiency). There was no correlated response in weight per year and in weight gain, and the effectiveness of low RFI selection in reducing feed costs was proven without affecting production. However, selection of animals with negative RFI is not done by selecting animals directly according to the size of the viscera, rather it is done indirectly, that is, when selecting the most efficient animals and normally these animals already have the smallest viscera size. The RFI is a trait that presents genetic variability, selectable to improve and has moderate heritability, between 0.30 and 0.35. The RFI is important because it reduces the direct economic impacts of reduced feed intake, as well as the effects of environmental impact on reducing methane emissions from enteric fermentation of ruminants.
剩余采食量作为选择肉牛遗传生产能力指标的研究进展
残采食量(RFI)等指标已被越来越多地用于选择饲料效率较高的牛,因为它是饲料效率的一个特征,计算方法是考虑代谢体重和增重的观察采食量与估计采食量之差。通过观察食用量对代谢平均活重和增重的多元回归方程得到估计采食量。该标准在选择低RFI(高效率)的畜群中共享,并与选择高RFI(低效率)的畜群进行比较。在年体重和增重方面没有相关反应,低RFI选择在不影响生产的情况下降低饲料成本的有效性得到了证明。然而,负RFI动物的选择并不是直接根据脏器的大小来选择动物,而是间接进行的,即在选择效率最高的动物时,通常这些动物的脏器大小已经最小。RFI是一种具有遗传变异性的性状,可选择性改良,遗传力适中,在0.30 ~ 0.35之间。RFI很重要,因为它减少了采食量减少的直接经济影响,以及环境影响对减少反刍动物肠道发酵甲烷排放的影响。
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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