血统的多样性和对卡塔丁羊的遗传选择的影响
Sara M Nilson1, Joan M Burke2, Brenda M Murdoch3
1Department of Animal Science, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.
概括
卡塔丁头发品种保持了足够的遗传多样性,以进行有效的基因组选择,并具有较低的近亲繁殖率. 然而,强烈的选择可能会威胁到长期的遗传多样性.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 羊的繁殖 羊的繁殖
背景情况:
- 卡塔赫丁头发品种在美国因其低输入特征和对寄生虫的耐药性而受到重视.
- 基因组增强估计育种值 (GEBV) 越来越多地用于牲畜遗传评估.
- 评估遗传多样性对于可持续的育种计划至关重要,特别是基因组选择.
研究的目的:
- 为了估计卡塔丁羊的血统完整性和质量.
- 计算品种和参考种群的遗传多样性统计数据.
- 评估当前遗传多样性对基因组选择精度的影响.
主要方法:
- 通过国家绵羊改进计划利用了92,030只卡塔丁羊 (1984-2019) 的血统数据.
- 计算有效种群大小 (Ne),代际间隔,近亲繁殖和亲属系数.
- 分析了整个血统和特定参考亚种群的多样性指标.
主要成果:
- 在特定的子集中,直到第七代,家谱的完整性超过了50%.
- 有效种群规模平均为111个,平均个体内生 (1.62%) 和亲属关系 (0.91%) 较低.
- 基因组选择的预测准确性与约15,000只动物的参考种群稳定.
结论:
- 卡塔丁品种具有足够的遗传多样性和有效的种群规模,适用于当前的基因组选择.
- 亲生繁殖和亲属关系的低率表明,遗传保护不是当前的优先事项.
- 建议进行长期监测,因为强烈的GEBV选择可能会降低遗传多样性.
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