SUMMARY Major feed ingredients, like maize and soya, and land resources are used by both humans and animals, causing competition and affecting costs. To make the poultry industry profitable, it is important to prevent wastage of feed, and feed efficiency is therefore important. Residual feed intake (RFI) and feed conversion ratio (FCR) are two measures of feed efficiency used to assess production efficiency. This review describes a different aspect of feed efficiency measures and how their correlated traits affect poultry production. Bird selection, based on RFI and FCR at the 5th week or market age, is effective since both are low to moderately heritable (heritability estimates of RFI and FCR are 0.21–0.49 and 0.11–0.44 respectively). Both RFI and FCR selection results in reduced feed intake without compromising growth rate. Selection based on RFI is better in comparison to FCR for improving feed efficiency, as it is a trait independent of the maintenance energy requirement of an individual bird. Bird with low RFI value can be expected to have better feed efficiency and can be helpful in lowering the cost of poultry production.

中文翻译：

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肉鸡剩余采食量、饲料转化率及相关生长参数的遗传分析：综述

总结 主要饲料原料，如玉米和大豆，以及土地资源被人类和动物使用，导致竞争并影响成本。为了使家禽业盈利，防止饲料浪费很重要，因此饲料效率很重要。剩余饲料摄入量 (RFI) 和饲料转化率 (FCR) 是用于评估生产效率的两种饲料效率指标。本综述描述了饲料效率测量的不同方面以及它们的相关性状如何影响家禽生产。基于第 5 周或市场年龄的 RFI 和 FCR 的鸟类选择是有效的，因为两者都具有低到中等的遗传性（RFI 和 FCR 的遗传力估计值分别为 0.21-0.49 和 0.11-0.44）。RFI 和 FCR 选择都会导致饲料摄入量减少，而不会影响生长速度。与 FCR 相比，基于 RFI 的选择更能提高饲料效率，因为它是一种独立于个体家禽维持能量需求的特性。低 RFI 值的家禽有望获得更好的饲料效率，有助于降低家禽生产成本。