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báo cáo khoa học: "On the genetic determinism of muscular hypertrophy in the Belgian White and Blue cattle breed"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: On the genetic determinism of muscular hypertrophy in the Belgian White and Blue cattle breed | Génét. Sél. Evol. 1985 17 3 369-386 On the genetic determinism of muscular hypertrophy in the Belgian White and Blue cattle breed II. Population data R. HANSET and c. MICHAUX Faculte de Médecine vétérìnaire U.LG 45 rue des Vétérinaires B-1070 Bruxelles Belgique Summary In this paper the transmission of the double-muscled condition is studied in the Belgian White and Blue cattle breed in a large body of testing station and field data. The distribution within the population of several phenotypic criteria related to the muscle development is shown to be systematically bimodal. In other words 2 biological entities conventional conv and double-muscling dm segregate within the commercial herds using Ạ.Ị. The 4 mating types dm X dm dm X conv conv X dm conv X conv produce the following percentages of dm offspring 86.1 p 100 42.4 p. 100 49.2 p. 100 24.1 p. 100. If environmental factors known to have an effect on the expression of the double-muscled condition are taken into account the percentage of double-muscled calves bom from dm X dm matings comes close to 100 p. 100. The finding of a break in the regression line of the percentage of double-muscled calves on the score of fleshiness of the parents is incompatible with a polygenic model with threshold. In agreement with an earlier paper analyzing experimental data Hanset Michaux 1985 it is also concluded from this study that a major gene symbol mh is involved. It is also shown that there is further genetic variation although smaller in magnitude playing a role in the expression of the double-muscled condition and that this would be amenable to selection. Key words Belgian White and Blue breed muscle hypertrophy inheritance major gene cattle. Résumé Le déterminisme génétique de I hypertrophie musculaire dans la race bovine Blanc-Bleu Beige. II. - Données de population Le déterminisme génétique du caractère culard est étudié dans la race bovine Blanc-Bleu Beige sur des données de station et de fermes. La distribution au sein