Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Estimation of crossbreeding parameters between Large White and Meishan porcine breeds. I. Reproductive performance | Genet. Sei. Evol. 1989 21 507-526 Elsevier INRA 507 Original article Estimation of crossbreeding parameters between Large White and Meishan porcine breeds. I. Reproductive performance J. p. Bidanel1 . Caritez2 and c. Legault1 1 Institut National de la Recherche Agronomique Station de Génétique Quantitative et Appliquée Centre de Recherches de Jouy-en-Josas 78350 Jouy-en-Josas 2 Domaine Experimental du Magneraud 17700 Surgères France received 14 June 1988 accepted 16 August 1989 Summary - A crossbreeding experiment using Large White LW and Meishan MS pig strains was conducted. Direct maternal and grand-maternal additive genetic effects along with direct maternal and paternal heterosis effects were estimated for litter productivity traits total number born TNB number born alive NBA number weaned NW litter weight at birth WB and at 21 days W21 either adjusted or not for litter size and survival rate from birth to weaning SR . Direct maternal additive and direct heterosis effects were also estimated for sow traits weight before farrowing SWF and at weaning SWW weight loss SWL and feed consumption SFC during lactation. Data from 267 litters farrowed by 117 sows were analysed. Between breeds additive differences in prolificacy are mainly maternal and piglets litter in favour of MS for TNB NBA and NW respectively . Maternal effects are also important but in favour of LW for adjusted litter weights. However due to litter size differences they are non-significant for unadjusted litter weights. Direct and grand-maternal differences are non-significant for all litter traits except SR where grand-maternal effects are in favour of MS 4 1 . Large additive differences also exist in sow traits LW dams are heavier 57 8 and 56 6 kg for SWF and sww respectively and consume more feed per female 22 7 kg or per piglet weaned kg than MS dams. On the other hand LW and MS dams do not differ for SWL and SFC per unit of litter growth rate. Extremely .
