support for single major genes influencing fat androstenone level and development of bulbo-urethral glands in young boars支持单一影响脂肪主要基因bulbo-urethral腺体的雄烯酮水平和发展年轻的野猪.pdfVIP

Original article Support for single major genes influencing fat androstenone level and development of bulbo-urethral glands in young boars MN Fouilloux P Le Roy J Gruand C Renard3 P Sellier M Bonneau 1 Station de génétique quantitative et appliquée, Institut national de la recherche agronomique, 78352 Jouy-en-Josas cedex; 2 Station expérimentale de sélection porcine, Institut national de la recherche agronomique, 86480 Rouillé; 3 Laboratoire de radiobiologie appliquée, Institut national de la recherche agronomique - Commissariat à l’énergie atomique, 78352 Jouy-en-Josas cedex; Station4de 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 mod