Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: D -Cn S1 α another allele associated with a decreased synthesis rate at the caprine α locus -casein S1 | Genet. Sei. Evol. 1989 21 127-129 Elsevier INRA 127 Note as1-CnD another allele associated with a decreased synthesis rate at the caprine as -casein locus 11 . Mahé and F. Grosclaude Institut National de la Recherche Agronomique Laboratoire de Génétique Biochimique. Centre de Jouy-en-Josas 78350 Jouy-en-Josas France received 20 September 1988 accepted 15 November 1988 Summary A seventh allele of the caprine as1-casein locus called xs1-CnD was observed in French Alpine and Saanen breeds. Its frequency in a large herd AZ 198 was . Like as1-CnB- as1-CnF and as1-Cn this allele is associated with a decreased synthesis rate its approximate mean contribution being - g l very close to that of as1-CnF. goat - ctsi-casein - polymorphism - quantitative variations Résumé Xsi-Cn0 un autre allèle à taux de synthèse rédult au locus de la caséine a -caprine. Un septième allèle du locus de la caséine as1-caprine as1-CrP a été observé dans lệs races Alpine etSaanen frangaises. Sa frequence dans un grandtroupeau N 198 était de 0 025. Comme asr-CrP as1-Crfet as1-Cn cet allèle est associé à un taux de synthèse réduìt sa contribution moyenne étarit d environ 0 6 à 0 8 g t done trồs proche de celle d asf-Crf. chẻvre - caséine as1 - polymorphlsme - variations quantltatlves Introduction Grosclaude et al. 1987 have recently concluded that the polymorphism of goat as1-casein is under the control of a minimum of 6 alleles. Alleles as1-CnA as1-CnB and as1-Cnc were found to be associated with a high as1-casein content approximate mean contribution of each allele being g l compared to as1-CnF and as1-CnB- which are associated respectively with a low content g l and an intermediate content g l while as1-Cn0 appeared to be a true null allele. In the same publication the authors mentioned the presence in the electrophoregrams of some milks of an additional band called X which reacted in immunoblotting with anti-as1-casein antibodies. We show in the present note that this
