Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh Original cung cấp cho các bạn kiến thức về sinh học đề tài:Phenotypic plasticity of body pigmentation in Drosophila: Genetic parameters of feeding behaviour and performance traits in group-housed. | Genet Sei Evol 1997 29 451-468 Elsevier Inra 451 Original article Genetic parameters of feeding behaviour and performance traits in group-housed Large White and French Landrace growing pigs F Labroue1 2 R Gueblez2 p Sellier1 1 Departement de génétique animale Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas cedex 2 Institut technique du pore La Motte au Vicomte BP 33 35651 Le Rheu cedex France Received 2 November 1996 accepted 14 August 1997 Summary - Data on feeding behaviour of 3 710 group-housed and ad libitum fed growing pigs were recorded using Acema 48 electronic feed dispensers. Genetic parameters for six feeding behaviour criteria and the main production traits routinely recorded in French central test stations three boar traits and three sib traits were estimated in two breeds Large White and French Landrace using a multiple trait animal model DF-REML procedure. Heritability estimates for feeding behaviour criteria ranged from to and were markedly higher than that for the food conversion ratio . Heritability of daily feed intake was in both breeds whereas heritabilities of rate of feed intake feed intake per meal and time per meal were slightly higher . Daily feed intake showed a very close genetic correlation around with average daily gain but also unfavourable genetic correlations with ultrasonic backfat thickness around and lean percentage around . Daily feed intake was genetically independent of food conversion ratio whereas average daily gain showed a favourable genetic correlation around with that trait. Among the feeding behaviour criteria feed intake per meal and rate of feed intake showed the highest genetic correlations with daily feed intake around and average daily gain around . They also showed moderately unfavourable genetic correlations with ultrasonic backfat thickness around and carcass lean percentage around
