在匈牙利繁殖的安格斯奶牛的初次分娩年龄的遗传性估计和相关性分析
Judit Márton1, Szabolcs Albin Bene2, Ferenc Szabó3
1Hungarian Hereford, Angus and Galloway Breeders Association, Dénesmajor 2, H-7400 Kaposvár, Hungary.
Animals : an open access journal from MDPI
|January 8, 2025
概括
选择母牛可以减少匈牙利安格斯牛的第一次分娩年龄 (AFC). 这项研究发现AFC具有很高的直接遗传性,这表明基因选择是有效的改善这一经济上重要的特征.
科学领域:
- 动物遗传学和动物繁殖
- 牲畜中的生殖生物学
背景情况:
- 第一次分娩时的年龄 (AFC) 是肉牛生产中的关键经济特征.
- 了解影响AFC的遗传和环境因素对于群体改善至关重要.
- 之前的研究报告了AFC的遗传概率估计的差异.
研究的目的:
- 为了调查匈牙利安格斯牛群的第一次分娩年龄 (AFC).
- 估计AFC.的遗传参数,包括遗传性和繁殖值 (BV).
- 分析遗传趋势并确定影响AFC的因素.
主要方法:
- 分析了2955头注册的安格斯牛和200头繁殖公牛的数据.
- 用一个通用线性模型进行差异分析和最好的线性无偏预测 (BLUP) 进行遗传参数估计.
- 线性回归分析用于趋势分析.
主要成果:
- 平均AFC为28.1±5.3个月,其中出生季节,出生年, sire 和群体的环境影响显著.
- 直接遗传 (h2 = 0.51 ± 0.06) 比之前报告的要高,而母性遗传是可以忽略不计的 (h2m = 0.00 ± 0.03).
- 在1998年至2021年期间,没有观察到AFC的显著表型或遗传趋势.
结论:
- 选择具有良好的繁殖价值 (BV) 的公主可以有效地降低安格斯女儿第一次分娩的年龄.
- AFC是经济上重要的特征,建议将AFC BV纳入公牛目录,以进行遗传改进.
- 环境因素起着重要作用,但遗传选择为优化AFC提供了可行的策略.
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