TAILIEUCHUNG - báo cáo khoa học: " Haemoglobin type frequencies in the Assaf (Awassi x East Friesian) dairy sheep 20 years after its formation"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Haemoglobin type frequencies in the Assaf (Awassi x East Friesian) dairy sheep 20 years after its formation | Génét. Sél. Evol. 1988 20 1 99-104 Note Haemoglobin type frequencies in the Assaf Awassi X East Friesian dairy sheep 20 years after its formation E. GOOTWINE Institute of Animal Science Agricultural Research Organization Bet Dagan Israel Summary Haemoglobin allele frequencies were examined in 195 ewes and 6 rams belonging to the Assaf cross Awassi X East Friesian . The frequency of the Hb A allele was indicating a decline in Hb yl frequency in the Assaf during the last 20 years Ewes belonging to the AB genotype showed a significant advantage over the BB genotype in both lamb and milk production in the first lactation. It is suggested that the haemoglobin polymorphism in the Assaf is maintained due to an advantage of AB heterozygotes for production and survival. Key words sheep haemoglobin Assaf breed milk production lamb production. Resume Frequences des types d hemoglobine dans la race ovine laitière Assaf Awassi X Frisonne de 1 Est 20 ans après sa creation Les frequences des allèles hémoglobine ont été étudiées chez 195 brebis et six béliers de la race Assaf Awassi X Frisonne de I Est La frequence de 1 allèle Hb A est de 0 14 indiquant une diminution de la frequence de cet allele chez les Assaf au cours des 20 dernières années. Les brebis de genotype AB possèdent une supériorité significative sur celles de genotype BB tant pour la production d agneaux que pour la production laitière en premiere lactation. Il est suggéré que le polymorphisme de 1 hémoglobine est maintenu dans la race Assaf grace à un avantage des hdterpzygotes AB pour les caractères de production et de viabilité. Mots clés ovin hémoglobine race Assaf production laitière production d agneaux. I. Introduction Two main electrophoretic types of sheep haemoglobin Hb designated A and B have been described Harris Warren 1955 . These types which were shown to be 100 E. GOOTWINE determined by two alleles at a single locus Evans et al. 1956 give rise to three genotypes AA AB and BB. Allele frequencies

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