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

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. I. Genetic parameters | Genet. Sel. Evol. 32 2000 41-56 INRA EDP Sciences 41 Original article Genetic parameters and genetic trends in the Chinese x European Tiameslan composite pig line. I. Genetic parameters 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 - Genetic parameters of body weight at 4 W4w 8 W8w and 22 W22w weeks of age days from 20 to 100 kg DT average backfat thickness at 100 kg ABT 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 were estimated in the Chinese X European Tiameslan composite line using restricted maximum likelihood methodology applied to a multiple trait animal model. Performance data from a total of 4 881 males and 4 799 females from 1 341 litters were analysed. Different models were fitted to the data in order to estimate the importance of maternal effects on production traits as well as genetic correlations between male and female performance. The results showed the existence of significant maternal effects on W4w W8w and ABT and of variance heterogeneity between sexes for W22w DT ABT and GTEAT. Genetic correlations between sexes were and respectively for W22w DT and ABT and above for the other traits. Heritability estimates were larger than ABT and TEAT or similar to other traits average literature values. Some genetic antagonism was evidenced between production traits particularly W4w W8w and ABT and reproductive traits. pigs genetic parameters performance trait reproductive trait Chinese breed Résumé Paramètres génétiques et evolutions génétiques dans la lignée composite sino-européenne Tiameslan. I. Paramètres génétiques. Les paramètres Permanent address Institute of .

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