The aim of this work was to analyze genetic parameters such as the inbreeding coefficient (F), relatedness coefficient (AR) and partial inbreeding coefficient (F_ij) of the whole PRE population, and the ancestors which account for 50% of the total genetic variability of the current population, from genealogical information. The average F of the whole PRE population (328,706 animals) has decreased from 8.45% to 7.51% in the least 20 years. The F_ij was estimated for the whole PRE population, resulting in a database of 58,772,533 records containing one record for each F_ij that each animal receives from a certain common ancestor (CA). A total of 10,244 CAs contributed to the F_ij with an average of 5370 descendants, with each descendant having an average of 170 CAs. Over the generations, the number of CAs has increased, while the proportion of F_ij by each one has decreased. In addition, the contributions of the more influential ancestors have changed. The increased census, the limited use of artificial insemination and our increased knowledge about inbreeding depression and the animals’ breeding values allow breeders to select horses more for their functionality and conformation than for their pedigree reputation, which is the cause of all these changes.

中文翻译：

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通过部分近交系数估计对Pura RazaEspañol马种群的遗传结构进行分析。

这项工作的目的是分析遗传参数，例如整个PRE种群的近交系数（F），相关系数（AR）和部分近交系数（F _ij），以及占总遗传量的50％的祖先根据族谱信息，当前人群的变异性。在过去的20年中，整个PRE种群（328,706只动物）的平均F已从8.45％降至7.51％。对整个PRE种群的F _ij进行了估算，结果得到了一个58,772,533条记录的数据库，其中包含每只动物从某个共同祖先（CA）获得的F _ij的一条记录。共有10,244个CA参与了_Fij拥有平均5370个后代，每个后代平均拥有170个CA。在几代人中，CA的数量增加了，而每个CA的F _ij的比例却减少了。此外，更有影响力的祖先的贡献也发生了变化。人口普查的增加，人工授精的使用有限以及我们对近亲抑郁的了解以及动物的育种价值，使育种者选择马匹的目的更多的是其功能和形态，而不是其血统书，这是所有这些变化的原因。