tailieunhanh - Báo cáo khoa hoc:"Effect of the slow (K) or rapid (k +) feathering gene on body and feather growth and fatness according to ambient temperature in a Leghorn × brown egg type cross"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Effect of the slow (K) or rapid (k +) feathering gene on body and feather growth and fatness according to ambient temperature in a Leghorn × brown egg type cross | 659 Genet Sei. Evol. 33 2001 659-670 INRA EDP Sciences 2001 Original article Effect of the slow K or rapid kC feathering gene on body and feather growth and fatness according to ambient temperature in a Leghorn X brown egg type cross Jean-Claude Fotsaa Philippe Mératb André Bordasb a Centre regional de recherche agricole de Nkolbisson Institut de recherche aGricole pour le développement BP 2067 Yaounde Cameroun b Laboratoire de génétique factorielle Institut national de la recherche agronomique Centre de recherche de Jouy-en-Josas Domaine de Vilvert 78352 Jouy-en-Josas Cedex France Received 4 December 2000 accepted 11 June 2001 Abstract - Chicks of both sexes issued from the cross of heterozygous K kC cocks for the slow-feathering sex linked K allele with k rapid feathering hens were compared from the age of 4 to 10 weeks at two ambient temperatures. In individual cages 30 male chicks of each genotype K kC and k k were raised at 21 C and 60 others distributed in the same way were raised at 31 C. 71 K W females and 69 kC W females were raised in a floor pen at 31 C till 10 weeks of age. In the males the body weight feed consumption and feed efficiency at different ages were influenced only by temperature lower growth rate and feed intake at 31 C no significant effects of the genotype at locus K nor genotype X temperature interaction were observed. In females all at 31 C the genotype K W or kC W had no significant effect on growth rate. Plumage weight and weight of abdominal fat absolute or related to body weight were measured on half of the males of each group in individual cages at 10 weeks of age. Moreover on 36 males and 48 females of the two genotypes in a group battery at 31 C the absolute and relative weight of plumage were measured on a sample every two weeks between 4 and 10 weeks. In the first case no significant effect of genotype appeared. In the second case an interaction between age and genotype was suggested from plumage weight its growth especially in