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基于多特征模型的内蒙古喀什米尔山羊早期生长特征的基因组预测方法的比较

Lin-Yu Gao¹, Qi Xu¹, Yu-Xiao He¹

¹College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China.

Yi chuan = Hereditas

|May 19, 2024

概括

该研究发现,内蒙古喀什米尔山羊的早期生长特征具有中度至低的遗传性,这表明基因改进缓慢. 选择断奶体重可以增强其他生长特征,ssGBLUP方法被证明是基因组育种价值估计的最准确方法.

科学领域:

动物遗传学动物遗传学
量化遗传学量化遗传学
畜牧养殖畜牧养殖畜牧养殖

背景情况:

内蒙古克什米尔山羊是一种有价值的双重用途品种,用于克什米尔和肉类.
准确的遗传评估对于畜牧业的改善至关重要,特别是对于早期生长特征.
多特征动物模型通过允许特征之间的间接选择来提高遗传评估的准确性.

研究的目的:

估计内蒙古喀什米尔山羊早期生长特征的遗传参数和基因组育种值.
为了比较不同遗传评估方法 (ABLUP,GBLUP,ssGBLUP) 的准确性和可靠性.
确定最佳策略,以基因改进这种品种的生长特征.

主要方法:

使用了内蒙古克什米尔山羊的血统,基因型,环境和表型记录.
构建了一个多特征动物模型来分析早期生长特征:出生体重,断奶体重,断奶前的平均每日体重增加和年龄体重.
使用ABLUP,GBLUP和ssGBLUP方法进行参数估计,并使用五倍交叉验证评估准确性.

主要成果:

早期生长特征的遗传概率估计在0.09到0.20之间,表明遗传概率中等到低.
在断奶体重和每日体重增加之间,以及每日体重增加和年龄体重之间观察到强烈的积极遗传相关性.
与ABLUP和GBLUP相比,ssGBLUP方法在估计所有研究特征的基因组繁殖值方面表现出最高的准确性.

结论:

内蒙古喀什米尔山羊的早期生长特征表现出中等到低的遗传性,限制了遗传改进的速度.
基于断奶体重的选择可以有效地推动其他与生长相关的特征的遗传改进.
在内蒙古喀什米尔山羊的基因组育种价值估计中,ssGBLUP方法是最准确和可靠的,表现优于ABLUP.

关键词:

内蒙古喀什米尔山羊喀什米尔山羊基因组估计的育种价值的准确性早期成长的特征早期成长的特征多特征动物模型动物模型

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