tailieunhanh - Báo cáo sinh học: "Genotype by environment interactions in relation to growth traits in slow growing chickens"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genotype by environment interactions in relation to growth traits in slow growing chickens | Genet. Sel. Evol. 39 2007 513-528 Available online at INRA EDP Sciences 2007 DOI gse 2007018 Original article Genotype by environment interactions in relation to growth traits in slow growing chickens Aya Lydie N DRIa Nadine SELLIERa Michèle TlXIER-BOICHARDb Catherine BEAUMONTa Sandrine MlGNON-GRASTEAUa a UR83 Recherches avicoles INRA 37380 Nouzilly France b UMR1236 Génétique et diversité animales INRA-INA PG Domaine de Vilvert 78352 Jouy-en-Josas France Received 3 November 2006 accepted 19 April 2007 Abstract - Since feed conversion ratio FCR is higher in slow-growing Label Rouge chickens than in broiler chickens it is important to work on its improvement in this breed. However this involves rearing animals in cages C an environment very different from that used for selection in floor pens S and production outdoor E . The aim of this study was to evaluate the importance of genotype by environment G X E interactions between S C and E environments to find the best way to select for FCR using 2002 related animals. Growth curve parameters were estimated and body composition measured. Individual feed conversion ratios FCR were recorded between 8 and 10 weeks in C. The presence of G X E interactions was assessed by the genetic correlations between the same trait recorded in different environments. Moderate but significant G X E interactions were detected for carcass traits a significant one was observed between E and S or C for growth curve parameters but none between C and S. If G X E interactions are set aside . selecting on traits recorded in C abdominal fatness is the best indirect selection criterion for FCR but if they are taken in account then leg yield or growth curve parameters in S and growth curve parameters in E are better. interaction genetic parameters feed efficiency chicken selection 1. INTRODUCTION Feed represents 70 of the total cost of broiler production. The feed conversion ratio FCR may be improved by direct selection