Abstract Based on pedigree information, the population structure, within-breed genetic variability and causes of genetic variability losses in Wallachian sheep (WS), and Sumava sheep (SS) were studied. The maximum number of generations observed in both WS and SS was 16, and the equivalent number of complete generations 5.66 and 4.35, respectively. The average generation intervals were in WS and SS 4.33 and 4.72 years, respectively. A span of four years, 2015–2018, was used as the reference population (animals from the last generation). The average inbreeding coefficient and average relatedness coefficient were 5 % and 9 % for WS, while both were 3 % for SS. The rate of the inbreeding coefficient was 0.5 % in WS and 1 % in SS. The effective number of founders, effective number of ancestors and effective number of founder genomes were 104, 50 and 22.8 for SS and 39, 21 and 10.28 for WS. The effective population size based on an increase in the inbreeding coefficient and computed based on average coancestry were 50.61 and 64.5 in WS and 99.56 and 166.14 in SS. These results indicate a low value of genetic diversity in Wallachian sheep. The loss of variability was caused by the bottleneck effect and partly also genetic drift and the unequal contribution of the founders.

中文翻译：

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两个捷克本土绵羊品种的遗传多样性评估

摘要 基于系谱信息，研究了瓦拉几亚羊（WS）和苏马瓦羊（SS）的种群结构、品种内遗传变异和遗传变异丢失的原因。在 WS 和 SS 中观察到的最大世代数为 16，完整世代的等效数分别为 5.66 和 4.35。平均世代间隔分别为 WS 和 SS 4.33 年和 4.72 年。2015-2018 年的四年跨度被用作参考种群（来自上一代的动物）。WS 的平均近交系数和平均相关系数分别为 5 % 和 9 %，而 SS 均为 3 %。近交系数的比率在 WS 中为 0.5%，在 SS 中为 1%。有效创始人数、有效祖先数和有效创始人基因组数分别为104、50和22。SS 为 8，WS 为 39、21 和 10.28。基于近亲繁殖系数增加并根据平均共同祖先计算的有效种群大小在 WS 中分别为 50.61 和 64.5，在 SS 中为 99.56 和 166.14。这些结果表明瓦拉几亚绵羊的遗传多样性价值较低。可变性的丧失是由瓶颈效应引起的，部分原因是遗传漂变和创始人的不平等贡献。