Importance of naturalized breeds as a base for the formation of exotic sheep (Ovis aries) breeds in tropical altitude regions

Abstract Recent molecular tools and technologies have marked the discovery of the origin and domestication processes of a wide variety of species, using either genomic or mitochondrial molecular markers to provide input for selection programs, as well as the management and conservation of animal breeds. This study aimed to analyze genes of mitochondrial DNA of the following sheep (Ovis aries) breeds: Pantaneira, Bergamácia, Dorper, White Dorper, Ile de France and Hampshire Down, to obtain their population genetic parameters and investigate the origin of these sheep populations reared in the State of Mato Grosso do Sul. The analysis of mitochondrial DNA allowed to infer their phylogenetic relationships and revealed significant differences among them when compared with each other and with sequences obtained from GenBank. Through the formation of haplotypes, it was noted that the Pantaneira breed served as the maternal basis for the formation of the other breeds reared in the region, and it was possible to suggest a European origin for the sheep populations studied.

摘要 近年来，分子工具与技术推动了诸多物种起源与驯化进程的研究进展，研究者可借助基因组或线粒体分子标记为家畜品种选育计划、管理及保护工作提供数据支撑。本研究针对以下绵羊（Ovis aries）品种的线粒体DNA（mitochondrial DNA）基因开展分析，具体包括潘塔内拉（Pantaneira）、贝加马西亚（Bergamácia）、杜泊（Dorper）、白杜泊（White Dorper）、伊勒德弗朗斯（Ile de France）以及汉普夏（Hampshire Down），旨在获取这些种群的群体遗传参数，并探究饲养于巴西南马托格罗索州的该类绵羊种群的起源。线粒体DNA分析可推断各群体的系统发育关系，且相较于彼此以及从基因库（GenBank）获取的序列，各群体间存在显著差异。通过单倍型（haplotype）构建分析，研究发现潘塔内拉品种是该区域内其他养殖绵羊品种形成的母系基础，同时可推定本次研究涉及的绵羊种群起源于欧洲。