Genetic parameters of feed efficiency traits in laying period of chickens. (25th May 2015)

• Record Type: Journal Article
• Authors: Yuan, Jingwei; Dou, Taocun; Ma, Meng; Yi, Guoqiang; Chen, Sirui; Qu, Lujiang; Shen, Manman; Qu, Liang; Wang, Kehua; Yang, Ning
• Is Part Of: Poultry science. Volume 94:Number 7(2015:Jul.)
• Page Start: 1470
• Page End: 1475
• Publication Date: 2015-05-25
• Subjects: feed efficiency -- laying period -- genetic parameter -- REML -- chicken; Poultry -- Periodicals; Poultry -- Periodicals; Poultry Diseases -- Periodicals; Electronic journals; 636.5005
• DOI: 10.3382/ps/pev122
• Languages: English
• ISSNs: 0032-5791

Abstract

Abstract: Laying records on 1, 534 F2 hens, derived from a reciprocal cross between White Leghorns and Dongxiang blue-shelled chickens, were used to estimate genetic parameters for residual feed intake (RFI), feed conversion ratio (FCR), daily feed intake (FI), metabolic BW (MBW), BW gain (BWG), and daily egg mass (EM) at 37 to 40 (T1) and 57 to 60 wk age (T2), respectively. Genetic analysis was subsequently conducted with the AI-REML method using an animal model. Estimates for heritability of RFI, FCR, and FI were 0.21, 0.19, and 0.20 in T1, and 0.29, 0.13, and 0.26 in T2, respectively. In T1 and T2, RFI showed high and positive genetic correlations with FCR (0.51, 0.43) and FI (0.72, 0.84), whereas the genetic correlation between FI and FCR was very low (−0.09, 0.11). Genetically, negative correlations were found between RFI and its component traits (−0.01 to −0.47). In addition, high genetic correlations, from 0.76 to 0.94, were observed between T1 and T2 for RFI, FCR, and FI, suggesting that feed efficiency traits in the 2 stages had a similar genetic background. The results indicate that selection for low RFI could reduce FI without significant changes in EM, while selection on FCR will increase EM. The present study lays the foundation for genetic improvement of feed efficiency during the laying period of chickens.