Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul. Av. Bento Gonçalves, Porto Alegre, RS 91501-970, Brazil.
Anim Genet. 2010 Jun;41(3):308-10. doi: 10.1111/j.1365-2052.2009.01986.x. Epub 2009 Nov 16.
Using ND5 sequences from mtDNA and 10 nuclear markers, we investigated the genetic differentiation of two South American Creole sheep phenotypes that historically have been bred in different biomes in southern Brazil. In total, 18 unique mtDNA haplotypes were detected, none of which was shared between the two phenotypes. Bayesian analysis also indicated two different groups (k = 2). Thus, these varieties are supported as being genotypically distinct. This situation could have resulted either from geographical isolation, associated with differences in the cultural habits of sheep farmers and in the way that flocks were managed, or more likely, from the introduction of different stocks four centuries ago.
利用来自 mtDNA 的 ND5 序列和 10 个核标记，我们研究了历史上在巴西南部不同生物群落中繁殖的两种南美克里奥尔绵羊表型的遗传分化。总共检测到 18 个独特的 mtDNA 单倍型，它们在两种表型之间没有共享。贝叶斯分析也表明存在两个不同的群体（k=2）。因此，这些品种在基因型上是不同的。这种情况可能是由于地理隔离造成的，这与绵羊养殖户的文化习惯以及羊群管理方式的不同有关，或者更可能是由于四个世纪前引入了不同的品种。
