TAILIEUCHUNG - báo cáo khoa học: "The in Southern African Nguni cattle. identification, occurrence and origin of the translocation"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The in Southern African Nguni cattle. identification, occurrence and origin of the translocation | Génét. Sél. Evol. 1985 17 3 293-302 A 1 29 chromosome translocation in Southern African Nguni cattle. The identification occurrence and origin of the translocation . NEL . HARRIS . WEIERMANS . MEYER and K. BRIX Animal and Dairy Science Research Institute Private Bag X2 Irene 1675 Republic of South Africa Department of Genetics University of the Orange Free State Bloemfontein Republic of South Africa. Summary A 1 29 chromosome translocation was found in p. 100 of a sample of 305 Nguni cattle. Investigations into the origin and spread of the translocation show a familial inheritance of the anomaly but give no indication as to the origin of the translocation. The high incidence was achieved despite the associated infertility and absence of artificial insemination which raises the question of a selective advantage in a particular environment. Normal and translocation hetero- and homozygous cattle are being produced in order to investigate this possibility. Key words Cattle Nguni chromosome abnormality translocation. Resume Mise en evidence frequence et origine de la translocation chromosomique 1-29 dans le bétaỉl Nguni d Afrique du Sud La translocation chromosomique 1-29 a été mise en evidence dans 10 2 p. 100 d un échantillon de 305 têtes de bétail Nguni. L etude de la diffusion de Cette translocation montre un mode de transmission héréditaire mais ne donne aucune indication sur son origine. Cette frequence élevée a été atteinte en dépit d une chute correlative de la fertilite et de 1 absence d insemination artificielle d oii la question posée de 1 avantage sélectií que conferait cette translocation dans un milieu particulier. Des animaux normaux et des transloqués homozygotes et heterozygotes sont actuellement procréés pour tester Cette éventualité. Mots clés Bovins Nguni anomalie chromosomique translocation. 294 . NEL et al. I. Introduction The Nguni cattle are the indigenous cattle found along the east coast of Southern Africa parts of the .

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