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在交叉羔羊中对断奶前生长和效率相关特征的直接和母性影响的遗传参数

Abdul Rahim¹, Rajni Chaudhary¹, R Pourouchottamane¹

¹North Temperate Regional Station, ICAR- Central Sheep and Wool Research Institute, Kullu, Himachal Pradesh, India.

Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie

|June 3, 2025

概括

这项研究估计了绵羊生长特征的遗传参数. 建议使用断奶体重 (WW) 作为改善整体生长的选择标准,因为它具有适度的遗传性和积极的遗传相关性.

科学领域:

动物遗传学和动物繁殖
量化遗传学量化遗传学
绵羊生产绵羊生产

背景情况:

精确估计遗传参数对于有效的畜牧养殖计划至关重要.
了解羊乳前生长特征的遗传基础对于提高羊群生产力至关重要.
交叉绵羊种群具有独特的遗传结构,需要特定的分析方法.

研究的目的:

为了估计在交叉绵羊中断奶前生长特征的 (共同) 差异成分和遗传参数.
评估固定效应对生长特征的影响.
确定最适合选择的特征,以提高整体生长性能.

主要方法:

从1891只羔羊的出生体重 (BW) 和1763只断奶体重 (WW) 的数据中利用了2012-2023年的数据.
在断奶前计算的平均每日体重增加 (PDWG),克莱伯比率 (PKR),生长效率 (PGE) 和相对生长率 (PGR).
采用动物模型和平均信息限制最大概率 (AI-REML) 算法来估计遗传参数,考虑固定效应,如出生年,遗传组,性别,出生类型和平等.

主要成果:

断奶前的特征受到出生年份,平度,出生类型和性别 (p < 0.05) 的显著影响.
直接遗传概率估计在0.11到0.18之间,而母性遗传概率估计在0.11到0.19之间.
断奶体重 (WW) 表现出中等的遗传性和与其他生长特征的高正遗传相关性,表明其作为选择标准的潜力. 对于早期生长而言,母亲的影响是显著的.

结论:

孕产妇的照顾对这只羊种的早期生长特征产生重大影响,因此需要在遗传评估中包括直接和孕产妇的影响.
断奶重量 (WW) 是一种合适的单一特征,用于选择,以提高研究群体在断奶前的整体生长性能.
这些发现为交叉绵羊种群的遗传改进策略提供了宝贵的见解.

关键词:

动物模型动物模型遗传参数遗传参数交叉绵羊之间的交叉绵羊断奶前的生长特征断奶前的生长特征有限制的最大概率.

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