Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: The cytogenetic screening | Genet Sei Evol 1991 23 109-117 Elsevier INRA 109 Original article The cytogenetic screening of South African artificial insemination bulls ND Nel EJ Harris JE Weiermans EHH Meyer Animal and Dairy Science Research Institute Private Bag X2 Irene 1 675 Republic of South Africa Received 20 March 1990 accepted 14 December 1991 Summary Following the discovery of the 1 29 chromosome translocation in Swedish artificial insemination Al bulls cytogenetic evaluation of South African Al bulls was initiated. The present paper reports on the 269 bulls screened over the past 11 yr. The 1 29 chromosome translocation was found in Brahman and Brown Swiss bulls while chimerism was present in the Friesian bulls. The overall incidence of chromosome abnormalities in these bulls is . Although the incidence is low discovery of the abnormalities serves to illustrate the importance of cytogenetic screening in the Al industry. cattle chromosome abnormality translocation chimerism Résumé Le contrôle cytogénétique des taureaux sud-africains d insemination arti-flcielle. A la suite de la découverte de la translocation chromosomique 1 29 chez des tau-reaux d insemination artificielle IA suédois I examen cytogénétique des taureaux d lA sud-africains a été entrepris. Get article conceme les 269 taureaux examines au cours dés 11 demières années. La translocation chromosomique 1 29 a été trouvée dans les races Brahman et Brune des Alpes et par ailleurs le chimerisme existe chez les taureaux de race Frisonne. L incidence globale des anomalies chromosomiques chez ces taureaux est de 1 49 . Bien que ce taux soit faible la découverte de ces anomalies illustre I importance d un contrôle cytogénétique pour les centres d lA. bovin anomalie chromosomique translocation chimérisme INTRODUCTION Artificial insemination has since its inception revolutionised the cattle breeding industry. There is however an ever-present danger in its widespread application undiagnosed genetic defects and less severe .
