Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Genetic diversity of selected genes that are potentially economically important in feral sheep of New Zealand | McKenzie et al. Genetics Selection Evolution 2010 42 43 http www.gsejournal.Org content 42 1 43 GSE Ge n et i cs Selection Evolution RESEARCH Open Access Genetic diversity of selected genes that are potentially economically important in feral sheep of New Zealand 1 2 1 z- I- 1 1 3 Grant W McKenzie Johanna Abbott Huitong Zhou Qian Fang Norma Merrick Rachel H Forrest J Richard Sedcole1 Jonathan G Hickford1 Abstract Background Feral sheep are considered to be a source of genetic variation that has been lost from their domestic counterparts through selection. Methods This study investigates variation in the genes KRTAP1-1 KRT33 ADRB3 and DQA2 in Merino-like feral sheep populations from New Zealand and its offshore islands. These genes have previously been shown to influence wool lamb survival and animal health. Results All the genes were polymorphic but no new allele was identified in the feral populations. In some of these populations allele frequencies differed from those observed in commercial Merino sheep and other breeds found in New Zealand. Heterozygosity levels were comparable to those observed in other studies on feral sheep. Our results suggest that some of the feral populations may have been either inbred or outbred over the duration of their apparent isolation. Conclusion The variation described here allows us to draw some conclusions about the likely genetic origin of the populations and selective pressures that may have acted upon them but they do not appear to be a source of new genetic material at least for these four genes. Background It is thought that livestock genetic variation has decreased through breed substitution and crossing of local and global breeds 1 . Accordingly interest in feral populations has increased because they are potential sources of genetic variation that may have been lost in commercial sheep flocks 2 3 . It has been argued that reintroducing genetic variability could enhance production in commercial breeds 4 . New Zealand NZ .
