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Study on distribution of coat color related alleles and white markings in a closed population of Lipizzan horses

机译：Lipizzan Horses封闭群体涂层颜色相关等位基因和白色标记分布的研究

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摘要

Coat color represents one of the major selection criteria in horse breeding, and thus phenotypic color spectra directly correlate with the changes of breeding objectives and aesthetic attitudes. In this study we used the Austrian Lipizzan breeding herd of the stud farm Piber to illustrate this process by genotyping single coat color related loci (MC1R, ASIP, STX17, SLC45A2/MATP, PMEL17/SILV, SLC36A1, PAX(6)(7)(0Y), SB1), phenotypic analyses of white markings and comparisons with historical records from the early 18th cen tury. The majority of Lipizzans was gray (98,1%), whereas 80,6% were homozygous for the G-allele on the STX17 locus. Beyond the gray coat 81,1% of horses were bay, 18,9% were black, chestnut horses did not occur and three heterozygous buckskins were detected. Three Lipizzans were phenotypically spotted, which could be drawn back to the Dominant White locus (segregation of the W20 allele). Compared to the 18th century, it could be shown, that besides the drift on the gray locus towards homozygosity, a shift from black color towards bay color occurred. Heritability estimates for white markings varied from 23% to 71%. The results of this study allow a precise breeding plan and selection strategy in favour of more phenotypic variability of coat color.
机译：涂层颜色代表马育种的主要选择标准之一，因此表型颜色光谱与育种目标和审美态度的变化直接相关。在这项研究中，我们使用了奥地利脂夏养殖群的螺柱农场Piber来通过基因分型单涂层颜色相关基因座（MC1R，ASIP，STX17，SLC45A2 / MATP，PMEL17 / SILV，SLC36A1，PAX（6）（7） （0Y），SB1），与第18届CEN Tury的历史记录的白色标记和比较的表型分析。大多数Lipizzans都是灰色（98,1％），而80,6％在STX17基因座上的G-等位基因纯合。除了灰色外套81,1％的马匹均为海湾，18,9％是黑色的，没有发生栗子马，检测到三个杂合的碎蛋白。三个Lipizzans是表型发现的，这可以被吸引回到主要的白色基因座（偏离W20等位基因）。与18世纪相比，可以表现出来，除了灰色轨迹朝纯合子的漂移外，发生了从黑色朝向海湾颜色的偏移。白色标记的遗传性估算从23％变化到71％。该研究的结果允许精确的育种计划和选择策略，支持更具表型涂层颜色的变异性。

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