MacNeil M D, Cronin M A, Blackburn H D, Richards C M, Lockwood D R, Alexander L J
USDA, Agricultural Research Service, 243 Fort Keogh Road, Miles City, MT 59301, USA.
Anim Genet. 2007 Jun;38(3):193-7. doi: 10.1111/j.1365-2052.2007.01559.x. Epub 2007 Apr 24.
The origin of cattle on Chirikof Island, off the coast of Alaska, is not well documented. We assessed genetic differentiation of cattle isolated on Chirikof Island from several breeds commonly used for commercial production in North America including breeds popularly believed to have contributed to the Chirikof Island population. A set of 34 microsatellite loci was used to genotype Angus, Charolais, Hereford, Highland, Limousin, Red Angus, Salers, Shorthorn, Simmental, Tarentaise and Texas Longhorn cattle sampled from North America and the Chirikof Island population. Resulting F(ST) statistics for these loci ranged from 0.06 to 0.22 and on average, 14% of total genetic variation was between breeds. Whether population structure was modelled as a bifurcating tree or genetic network, Chirikof Island cattle appeared to be unique and strongly differentiated relative to the other breeds that were sampled. Bayesian clustering for multiple-locus assignment to genetic groups indicated low levels of admixture in the Chirikof Island population. Thus, the Chirikof Island population may be a novel genetic resource of some importance for conservation and industry.
位于阿拉斯加海岸外的奇里科夫岛上牛群的起源没有充分的文献记载。我们评估了奇里科夫岛上隔离的牛群与北美几种常用于商业生产的品种之间的遗传分化情况，这些品种包括普遍认为对奇里科夫岛牛群有贡献的品种。一组34个微卫星基因座被用于对从北美和奇里科夫岛牛群中采样的安格斯牛、夏洛莱牛、赫里福德牛、高地牛、利木赞牛、红安格斯牛、萨勒斯牛、短角牛、西门塔尔牛、塔兰泰斯牛和德克萨斯长角牛进行基因分型。这些基因座的F(ST)统计结果在0.06到0.22之间，平均而言，总遗传变异的14%存在于品种之间。无论种群结构被建模为二叉树还是遗传网络，奇里科夫岛的牛相对于其他采样品种似乎都是独特且高度分化的。多位点基因分组的贝叶斯聚类表明奇里科夫岛牛群中的混合程度较低。因此，奇里科夫岛牛群可能是一种对保护和产业具有一定重要性的新型遗传资源。
