tailieunhanh - báo cáo khoa học: "Genetic variation of flesh colour in canthaxanthin fed rainbow trout"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Genetic variation of flesh colour in canthaxanthin fed rainbow trout | Génét. Sél. Evol. 1985 17 2 243-250 Genetic variation of flesh colour in canthaxanthin fed rainbow trout . BLANC and G. CHOUBERT . Laboratoire d Ecologie des Poissons etd Amenagement des Pêches __Centre de Recherches hydrobiologiques BP. 3 Saint-Pée-sur-Nìvelle F 64310 Ascain . Laboratoire de Nutrition et d- Elevage des Poissons Centre de Recherches hydrobiologiques . 3 Saint-Pée-sur-Nivelle F 64310 Ascain Summary Genetic experiments were conducted using either random independent full-sib families 9 and 11 respectively or sire-half-sib families 18 of rainbow trout who were fed an experimental diet supplemented with canthaxanthin. The resulting orange-red colour of the flesh from each fish was analyzed through spectrophotometry and expressed in standard terms of luminosity Y dominant wavelength Id and excitation purity Pe . The following results were obtained There is a substantial genetic variability among families in each colorimetric parameter. Estimated values of heritability from full-sib and from half-sib families do not differ significantly. Positive correlation between Li and pe and negative correlations between Y and Id and between Y and pe are consistent with the pattern of canthaxanthin deposition in the flesh. Genetic correlations do not differ significantly from phenotypic ones. Pigmentation intensity is correlated to fish weight. This relationship however accounts for but a minor part of colour variation among market-size fishes. Key words Genetics colour canthaxanthin salmonids. Resume Variation génétique de la couleur de la chair chez la truite arc-en-ciel alỉmentée avec de la canthaxanthine Des expériences génétiques ont été réalisées chez la Truite arc-en-ciel sur des families aléatoires et indépendantes de pleins-freres au nombre de 9 et 11 OU demi-freres de peres 18 alimentees par un régime experimental supplémẹnté en canthaxanthine. La couleur de chair orange-rouge obtenue chez chaque poisson a été analysee par