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Selection of reproductive partners in semi-feral horses (Equus caballus) is not influenced by Major Histocompatibility Complex (MHC): A field study
Applied Animal Behaviour Science ( IF 2.3 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.applanim.2020.104973
Joanna Jaworska , Zbigniew Jaworski , Dawid Tobolski , Marta Siemieniuch , Tomasz Janowski , Aleksandra Górecka-Bruzda

Abstract Major histocompatibility complex (MHC) is a suggested criterion of reproductive mate choice in many species. MHC-dissimilarity was suggested to play role in male selection by female horses (mares) in experimental settings. In our project, we asked whether under natural conditions mares choose breeding stallions guided by a certain MHC-type, either MHC-dissimilar or MHC-diverse. We observed the reproductive behavior of 26 mares and five stallions of semi-feral Konik Polski horses for eight years from which only 4 stallions and 16 mares could be used in analysis. Between-group (harems) migrations of mares and stallions and the composition of harems were noted. The choice of a reproductive partner was confirmed by observation (a mare present in the harem of a chosen stallion) and by the actual reproductive outcome (parentage of foals). The MHC of mares and stallions was tested using 11 MHC microsatellites. Genetic similarity in MHC was measured by pairwise relatedness and allele sharing between mares and stallions. MHC heterozygosity of every stallion was calculated. For all mares the choice of reproductive partner was the harem stallion. No extra-harem matings were observed. Allele sharing did not differ between mating pairs and between all of the possible combinations of mares and stallions (0.36 vs. 0.33; P = 0.66). Genetic similarity in MHC between mares and stallions did not influence the choice of reproductive partner by mares (P > 0.05), but mares tended (P = 0.08) to stay in harems of MHC-diverse stallion. The present findings suggest that mares in semi-feral conditions do not actively search for MHC dissimilar stallions, however they might favour MHC diverse ones. However, because the choice of reproductive partner was the current harem stallion, in the case of every mare we speculate that in feral conditions selection of reproductive stallion by mares might be either restricted or influenced by variety of factors other than MHC of a stallion.

中文翻译:

半野马(Equus caballus)生殖伙伴的选择不受主要组织相容性复合体(MHC)的影响:一项实地研究

摘要 主要组织相容性复合体 (MHC) 是许多物种繁殖配偶选择的建议标准。建议 MHC 差异在实验环境中雌性马(母马)的雄性选择中发挥作用。在我们的项目中,我们询问母马是否在自然条件下选择由某种 MHC 类型(MHC 异种或 MHC 多样化)引导的种马。我们观察了 26 匹母马和 5 匹半野马 Konik Polski 马的繁殖行为 8 年,其中只有 4 匹种马和 16 匹母马可用于分析。注意到母马和种马的群间(后宫)迁徙以及后宫的组成。繁殖伙伴的选择是通过观察(一匹母马出现在选定种马的后宫中)和实际繁殖结果(小马驹的血统)来确认的。母马和种马的 MHC 使用 11 颗 MHC 微卫星进行了测试。MHC 中的遗传相似性通过母马和种马之间的成对相关性和等位基因共享来衡量。计算每匹种马的 MHC 杂合度。对于所有母马来说,生殖伙伴的选择是后宫种马。没有观察到额外的后宫交配。等位基因共享在交配对之间以及母马和种马的所有可能组合之间没有差异(0.36 对 0.33;P = 0.66)。母马和种马之间 MHC 的遗传相似性不影响母马对生殖伙伴的选择 (P > 0.05),但母马倾向于 (P = 0.08) 留在 MHC 多样化种马的后宫。目前的研究结果表明,处于半野生状态的母马不会主动寻找 MHC 不同的种马,但它们可能偏爱 MHC 不同的种马。
更新日期:2020-05-01
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