tailieunhanh - Báo cáo sinh học: " Genetic differentiation between the Old and New types of Serbian Tsigai sheep"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genetic differentiation between the Old and New types of Serbian Tsigai sheep | Genet. Sel. Evol. 40 2008 321-331 INRA EDP Sciences 2008 DOI gse 2008006 Available online at Original article Genetic differentiation between the Old and New types of Serbian Tsigai sheep Mirjana CINKULOV1 Miika TAPIO2 Mikhail Ozerov2 Tatyana Kiselyova3 Nurbiy Marzanov4 Ivan Pihler1 Ingrid Olsaker5 Mensur VEGARA6 Juha KANTANEN2 1 Department of Animal Science Faculty of Agriculture University of Novi Sad 21000 Novi Sad Serbia 2 Biotechnology and Food Research MTT Agrifood Research Finland 31600 Jokioinen Finland 3 All-Russian Research Institute of Animal Genetics and Breeding Russian Academy of Agricultural Science 189620 St Petersburg-Pushkin Russia 4 All-Russian Research Institute of Animal Husbandry Russian Academy of Agricultural Science 142132 Dubrovitsy Russia 5 Department of Basic Sciences and Aquatic Medicine Norwegian School of Veterinary Science PO Box 8146 Dep. 0033 Oslo Norway 6 Noragric Department of International Environment and Development Studies Norwegian University of Life Sciences UMB . Box 5003 1432 Ảs Norway Received 23 July 2007 accepted 13 November 2007 Abstract - Two Tsigai sheep populations exist in Serbia the Old type called Cokan and the New type. It is assumed that the New type results from upgrading Tsigai sheep with exotic genetic material. We investigated genetic diversity and differentiation of these types by analysing 23 autosomal microsatellites. Tests for Hardy-Weinberg proportions linkage equilibrium between genotypes across loci and the calculation of inbreeding coefficients were performed and the deficiency in the number of alleles within the Tsigai types was examined using a Wilcoxon sign-rank test. The New type displayed a higher level of genetic variability than the Cokan in terms of allele numbers but the New Tsigai showed a pattern of heterozygosity deficiency. The positive f value for the Cokan suggests the occurrence of inbreeding in this type. The proportion of linkage disequilibrium was .