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首页> 外文期刊>Tropical Animal Health and Production >Genetic diversity and population structure of South African smallholder farmer sheep breeds determined using the OvineSNP50 beadchip
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Genetic diversity and population structure of South African smallholder farmer sheep breeds determined using the OvineSNP50 beadchip

机译：使用ovinesnp50珠芯片测定南非小农农民绵羊品种的遗传多样性和人口结构

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摘要

A population structure study was performed in South African ovine populations using the OvineSNP50 beadchip. Blood samples were obtained from 295 sheep of which 172 had been identified as smallholder Dorpers, 4 smallholder White Dorpers, 46 purebred Dorpers, 26 purebred South African Mutton Merinos and 47 purebred Namaqua Afrikaners. Blood from the latter three breeds were obtained from a resource flock maintained on the Nortier research farm. Genetic diversity was estimated using allelic richness (A (r)), observed heterozygosity (H (o)), expected heterozygosity (H (e)) and inbreeding coefficient (F). Population structure analysis was performed using fastSTRUCTURE to determine the breed composition of each genotyped individual. The Namaqua Afrikaner had the lowest H (e) of 0.280 +/- 0.18 while the H (e) of smallholder Dorper, Dorper and South African Mutton Merino did not differ and were 0.364 +/- 0.13, 0.332 +/- 0.16 and 0.329 +/- 0.17, respectively. The average inbreeding coefficient was highest for the pure breeds, Namaqua Afrikaner, Dorper and South African Mutton Merino compared to the average inbreeding coefficient for the smallholder Dorper population. The smallholder Dorper were introgressed with Namaqua Afrikaner, South African Mutton Merino and White Dorpers. Similarly, the smallholder Dorper population was more genetically diverse than the purebred Dorper, South African Mutton Merino and Namaqua Afrikaner from the research farm. The higher genetic diversity among the smallholder sheep may be advantageous for their fitness and can be used to facilitate selective breeding.
机译：使用ovinesnp50珠芯片在南非绵羊群中进行人口结构研究。从295只绵羊获得血液样品，其中172名已被确定为小型啤酒Dorpers，4名小农白Dorpers，46名纯种Dorpers，26名纯种南非羊肉梅林斯和47名纯种Namequa Afrikaners。从后面的三种品种的血液从维持在北尔研究场上的资源群中获得。使用等位基因丰富度（A（R）），观察到的杂合性（H（O）），预期的杂合性（H（e））和近亲繁殖系数（F）估计遗传多样性。使用仓结构进行人口结构分析，以确定每个基因分型个体的品种组成。 Namaqua Afrikaner的H（e）的最低H（e）为0.280 +/- 0.18，而小小孩Dorper，Dorper和南非羊肉Merino的H（e）没有差异，0.364 +/- 0.13,0.332 +/- 0.16和0.329 +/- 0.17分别。纯品种的平均近亲繁殖系数最高，纯品种，南宫南非荷兰油，Dorper和南非羊肉Merino相比，与小农暴毒人口的平均近亲繁殖系数相比。小小孩Dorper患有Namaqua Afrikaner，南非羊肉Merino和White Dorpers。同样，小农众多人口比纯种Dorper，南非羊肉Merino和来自研究农场的Namaqua Afrikaner更具遗传多样化。小农羊的遗传多样性对于它们的健身可能是有利的，并且可以用于促进选择性育种。

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