TAILIEUCHUNG - Báo cáo khoa hoc:" Genetic parameters and genetic trends in the Chinese x European Tiameslan composite pig line. II. Genetic trends"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genetic parameters and genetic trends in the Chinese x European Tiameslan composite pig line. II. Genetic trends | Genet. Sel. Evol. 32 2000 57-71 INRA EDP Sciences 57 Original article Genetic parameters and genetic trends in the Chinese x European Tiameslan composite pig line. II. Genetic trends Siqing ZHANGa Jean-Pierre BlDANELa Thierry BURLOTb Christian LEGAULTa Jean NAVEAUb a Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas Cedex France b Pen Ar Lan . 3 35380 Maxent France Received 25 June 1999 accepted 8 December 1999 Abstract - The Tiameslan line was created between 1983 and 1985 by mating Meishan X Jiaxing crossbred Chinese boars with sows from the Laconie composite male line. The Tiameslan line has been selected since then on an index combining average backfat thickness ABT and days from 20 to 100 kg DT . Direct and correlated responses to 11 years of selection were estimated using BLUP methodology applied to a multiple trait animal model. A total of 11 traits were considered . ABT DT body weight at 4 W4w 8 W8w and 22 W22w weeks of age teat number TEAT number of good teats GTEAT total number of piglets born TNB born alive NBA and weaned NW per litter and birth to weaning survival rate SURV . Performance data from a total of 4 881 males and 4 799 females from 1 341 litters were analysed. The models included both direct and maternal effects for ABT W4w and W8w. Male and female performances were considered as different traits for W22w DT and ABT. Genetic parameters estimated in another paper Zhang et al. Genet. Sel. Evol. 32 2000 41-56 were used to perform the analyses. Favourable phenotypic AP and direct genetic trends AGd were obtained for post-weaning growth traits and ABT. Trends for maternal effects were limited. Phenotypic and genetic trends were larger in females than in males for ABT . AGd vs. - mm year were larger in males for W22w AGd vs. kg year and were similar in both sexes for DT AGd vs. - day year . Phenotypic and genetic trends were slightly favourable for

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