在多品种绵羊群中,用于屠宰特征的遗传 (共变) 组件
N McHugh1, T Pabiou2, K McDermott2
1Teagasc, Animal & Grassland Research and Innovation Centre, Moorepark, Fermoy P61 P302, Co. Cork, Ireland.
Animal : an international journal of animal bioscience
|July 12, 2023
概括
这项研究发现,在绵羊尸体特征和屠宰年龄中存在显著的遗传变异性,使得使用活体体重测量进行遗传优点预测. 这些发现对于提高肉羊企业的利能力至关重要.
科学领域:
- 动物遗传学动物遗传学
- 量化遗传学 量化遗传学
- 畜牧业生产 畜牧业生产
背景情况:
- 尸体价值和屠宰时的年龄显著影响肉羊企业的收入和生产成本.
- 对于影响尸体价值 (体重,形状,脂肪) 和屠宰年龄的特征中可利用的遗传变异性,人们的理解有限.
- 估计遗传 (共) 差异对于优化育种策略至关重要.
研究的目的:
- 估计尸体重量,形状,脂肪,杀死百分比和屠宰时的年龄的遗传 (共) 差异.
- 评估这些特征与早期生命测量之间的遗传 (共) 差异.
- 为了确定在经济上重要的绵羊特征中可利用的遗传变异性的程度.
主要方法:
- 对15714只羊羔的屠宰记录进行分析,包括对12630只羊羔的活体重测量.
- 对尸体和活体体重特征的遗传性和遗传相关性的估计.
- 对关键特征的遗传变异系数的计算.
主要成果:
- 遗传概率估计在0.08 (尸体脂肪) 到0.22 (杀死率) 之间.
- 在断奶后的活体重和尸体体重 (0.83) 之间发现了显著的遗传相关性.
- 活体体重测量准确地预测了尸体特征和屠宰年龄的遗传价值.
结论:
- 对于绵羊屠宰特征,存在可利用的大量遗传变异性.
- 在生命早期采取的活体体重测量可以用于遗传体特征和屠宰年龄的遗传选择.
- 精确的遗传优点预测是可以实现的,提高了绵羊育种计划的选择效率.
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