tailieunhanh - Báo cáo sinh học: "Phenotypic plasticity of body pigmentation in Drosophila: for single major genes influencing fat androstenone level and development of bulbo-urethral glands in young boars"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh Original cung cấp cho các bạn kiến thức về sinh học đề tài:Phenotypic plasticity of body pigmentation in Drosophila: for single major genes influencing fat androstenone level and development of bulbo-urethral glands in young boars. | 357 Genet Sei Evol 1997 29 357-366 Elsevier Inra Original article Support for single major genes influencing fat androstenone level and development of bulbo-urethral glands in young boars MN Fouilloux1 p Le Roy1 J Gruand2 c Renard3 p Sellier1 M Bonneau 4 1 Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas cedex 2 Station experimentale de selection porcine Institut national de la recherche agronomique 86480 Rouillé 3 Laboratoire de radiobiologie appliquée Institut national de la recherche agronomique -Commissariat à 1 énergie atomique 78352 Jouy-en-Josas cedex 4 Station de recherches porcines Institut national de la recherche agronomique 35590 Saint-Gilles France Received 21 April 1997 accepted 5 June 1997 Summary - A two-step genetic analysis was performed on data collected in a four-generation selection experiment comprising a control and a selected line in a Large White-Landrace crossbred population. The two-trait selection index used for choosing replacement boars of the selected line included fat androstenone level and the average thickness of right and left bulbo-urethral glands the latter trait being an indicator of the sexual maturity status of young boars. Fat androstenone level was determined on a biopsy sample of backfat taken at 118 kg liveweight whereas bulbo-urethral gland size was measured by echotomography using a rectal probe at 99 kg liveweight. A total of 949 entire males from 57 sires and 353 dams were recorded for both traits. In the first step of analysis REML genetic parameters were estimated using a bivariate animal model. Heritability estimates SE were for fat androstenone level and for bulbo-urethral gland size. A fairly close genetic correlation was found between the two traits. The second step of analysis consisted in testing the hypothesis of a mixed mode of inheritance polygenes major gene for each trait using segregation analysis methods. A .