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连续选择在基维十字®复合品种对品种祖先和生产力表现的影响

Mohd Jaafar¹, Bevin Harris², Heather J Huson¹

¹Animal Science Department, Cornell University, Ithaca, NY 14850, USA.

Animals : an open access journal from MDPI

|January 25, 2025

概括

基维克罗斯 (KiwiCross®) 牛是一种复合品种,在BTA 7和20上显示基因组选择特征. 这些签名表明,为了提高生产效率 (PR),人工选择保留了特定的霍尔斯坦-弗里森和泽西祖先地区.

科学领域:

动物遗传学动物遗传学
乳牛养殖乳牛养殖乳牛养殖
基因组选择基因组选择

背景情况:

复合牛品种是将多种品种结合在一起,以增强可取的特征.
基维克罗斯®是一种新西兰复合品种,融合了荷尔斯坦-弗里西亚和泽西品种.
生产效率 (PR) 是乳牛的关键选择指数,计算为每成熟活体体重的牛奶固体.

研究的目的:

在KiwiCross®复合品种的人工选择下调查基因组区域.
为了确定特定的祖先品种贡献 (荷尔斯坦-弗里斯和泽西) 给选定的基因组区域.
了解生产效率选择对品种特异性单双型保存的影响.

主要方法:

基因组分析使用XP-EHH,hapFLK和ROH类型统计数据.
在特定的牛自体 (BTA) 上识别选择签名.
高性能和低性能KiwiCross®动物之间的基因组区域的比较.

主要成果:

在KiwiCross®牛的BTA 7和BTA 20上发现了选择特征.
发现了与霍尔斯坦 - 弗里斯和泽西祖先相关的独特基因组区域.
证据表明,选择在不同基因组区域上跨世代发挥作用.

结论:

为了提高生产效率,人工选择塑造了KiwiCross®牛的基因组.
保护祖先特定的单元类型对于维持复合品种的表现至关重要.
育种者应该意识到,由于选择,可能会失去有益的品种特异性哈普洛类型.

关键词:

发生的事情FLKK 在KiwiCross®上使用.罗赫罗赫罗赫罗赫罗赫罗赫在XP-EHHHH的时候.添加剂混合物添加剂人工选择人工选择这种品种的祖先.杂种的杂种,就是杂种.遗传签名遗传签名遗传签名提高生产效率,提高生产效率.

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