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Status of the genetic diversity and population structure of the Pga donkey

机译：Pga驴的遗传多样性和种群结构状况

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摘要

Pedigree analysis was extended to the Pga donkey population in order to evaluate the status of genetic diversity and population structure. All parameters were computed for three reference populations of animals born between 2004 and 2014: all animals, animals with mouse gray coat color, and animals with roan coat color. Although the average inbreeding coefficient observed was low (about 3 %), highly inbred animals are present in the current population. The effective population size based on the individual inbreeding rate was 35, while the effective population size based on the individual coancestry rate was about three times higher. The number of equivalent subpopulations was at around three, indicating that the Pga donkey population is highly structured. There is no evidence of differentiation between subpopulations based on the coat color of the animals (Nei's minimum distance 0.10 %). The breeding policy of Pga donkeys is predominantly intra-herd. The loss of genetic diversity since the founder generations can be considered small in Pga donkeys (1.25 %). The excessive contribution of few ancestors to the gene pool may lead to narrower bottlenecks in the pedigree of this population in the future. The long generation interval in Pga donkeys (10.7 years) may be considered an advantage to reduce the increase in inbreeding and to maintain the genetic diversity of these animals.
机译：家谱分析扩展到Pga驴种群，以评估遗传多样性和种群结构的状况。计算了2004年至2014年之间出生的三个参考种群动物的所有参数：所有动物，具有老鼠灰大衣颜色的动物和具有软皮大衣颜色的动物。尽管观察到的平均近交系数很低（约3％），但当前种群中存在高度近交的动物。基于个体近亲繁殖率的有效种群规模为35，而基于个体近亲繁殖率的有效种群规模大约高三倍。等效亚群的数量约为3，这表明Pga驴种群结构高度。没有证据表明根据动物的毛色区分亚群（Nei的最小距离为0.10％）。 Pga驴的繁殖政策主要是内部饲养。自始祖代以来，遗传多样性的丧失在Pga驴中被认为很小（1.25％）。少数祖先对基因库的过度贡献可能会导致将来该种群谱系中的瓶颈缩小。 Pga驴的长世代间隔（10.7年）可被视为减少近亲繁殖的增加并保持这些动物遗传多样性的一个优势。

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