tailieunhanh - Báo cáo sinh học: " Quantitative genetics of growth traits in the edible snail, Helix aspersa Müller"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Quantitative genetics of growth traits in the edible snail, Helix aspersa Müller | 571 Genet Sei Evol 1997 29 571-587 Elsevier Inra Original article Quantitative genetics of growth traits in the edible snail Helix aspersa Muller M Dupont-Nivet u J Mallard2 JC Bonnet1 JM Blanc3 1 Hell ciculture Institut national de la recherche agronomique domaine du Magneraud BP 52 17700 Surgères 2 Laboratoire de génétique École nationale supérieure agronomique de Rennes 65 rue de Saint-Brieuc 35042 Rennes cedex 3 Station d hydrobiologie Institut national de la recherche agronomique BP 3 64310 Saint-Pée-sur-Nivelle France Received 13 September 1996 accepted 8 September 1997 Summary - Genetic parameters of adult weight age at maturity adult age weight after hibernation and relative loss of weight during hibernation were estimated in a population of edible snails Helix aspersa Muller . Eight thousand four hundred and eighthy three animals were sampled from 143 pairs for adult weight 4 333 from 87 pairs for adult age and 2 256 from 123 pairs for traits after hibernation. An animal model taking into account all the relationships was used to estimate genetic parameters. Estimates were also computed from the covariances between full-sibs and parent offspring regressions to assess possible non-additive genetic effects. Heritabilities were high except for relative loss of weight during hibernation. Estimates from the animal model were for adult weight for adult age for weight after hibernation and for relative loss of weight during hibernation. Adult weight and adult age were neither phenotypically nor genetically correlated and respectively . A substantial maternal effect especially on adult weight was found. growth I heritability genetic correlation Helix aspersa Resume Génétique quantitative des caractères de croissance chez 1 escargot comestible Helix aspersa Miiller. Les paramètres génétiques de plusieurs caractères de crois-sance ont été estimés dans une population d escargots Petit-Gris Helix aspersa Muller .