tailieunhanh - Báo cáo sinh học: "Genetic variability in residual feed intake in rainbow trout clones and testing of indirect selection criteria (Open Access publication)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Genetic variability in residual feed intake in rainbow trout clones and testing of indirect selection criteria (Open Access publication) | Genet. Sel. Evol. 40 2008 607-624 INRA EDP Sciences 2008 DOI gse 2008026 Available online at Original article Genetic variability in residual feed intake in rainbow trout clones and testing of indirect selection criteria Open Access publication Laure Grima1 2 Edwige Quillet1 Thierry Boujard1 Christele Robert-GraniE3 Beatrice Chatain2 Muriel Mambrini1 1INRA UR 544 Génétique des poissons Domaine de Vilvert 78350 Jouy-en-Josas France 2Ifiemer Station d aquaculture experimentale chemin de Maguelone 34250 Palavas-les-Flots France 3INRA UR 631 Station d amelioration genetique des animaux bp 52627 31320 Castanet-Tolosan France Received 10 January 2008 accepted 1st July 2008 Abstract - Little is known about the genetic basis of residual feed intake RFI variation in fish since this trait is highly sensitive to environmental influences and feed intake of individuals is difficult to measure accurately. The purpose of this work was i to assess the genetic variability of RFI estimated by an X-ray technique and ii to develop predictive criteria for RFI. Two predictive criteria were tested loss of body weight during feed deprivation and compensatory growth during re-feeding. Ten heterozygous rainbow trout clones were used. Individual intake and body weight were measured three times at three-week intervals. Then individual body weight was recorded after two cycles of a three-week feed deprivation followed by a three-week re-feeding. The ratio of the genetic variance to the phenotypic variance was found high to moderate for growth feed intake and RFI VG VP respectively . The index that integrates performances achieved during deprivation and re-feeding periods explained 59 of RFI variations. These results provide a basis for further studies on the origin of RFI differences and show that indirect criteria are good candidates for future selective breeding programs. rainbow trout clone residual feed intake indirect criteria .