洪都拉斯霍尔斯坦牛的牛奶产量和生殖特征的遗传参数
Raciel Javier Estrada-León1, Manuel Antonio Valladares-Rodas2, Angel Carmelo Sierra Vázquez3
1Tecnológico Nacional de México, Instituto Tecnológico Superior de Calkini. C.A. Bioprocesos, Av. Ah Canul S/N por Carretera Federal. Calkiní, Campeche, Calkin?, C.P. 24900, México.
Tropical animal health and production
|May 24, 2024
概括
估计了洪都拉斯霍尔斯坦牛的牛奶产量和生殖特征的遗传参数. 仅仅为了牛奶产量而进行选择可能会降低生殖效率;为了实现可持续的改善,建议在育种计划中包括生殖特征.
科学领域:
- 动物遗传学动物遗传学
- 乳制品科学 乳制品科学
- 生殖生物学 生殖生物学
背景情况:
- 荷尔斯坦牛对全球乳制品生产至关重要.
- 了解牛奶产量和繁殖的遗传参数对于高效的育种计划至关重要.
- 对于洪都拉斯霍尔斯坦种群中这些参数的数据有限.
研究的目的:
- 为了估计牛奶产量 (MY305) 的变异组件和遗传参数,分娩到怀孕间隔 (CCI),每次怀孕服务的数量 (NSC) 和分娩间隔 (CI) 在洪都拉斯霍尔斯坦牛中.
- 分析牛奶产量与生殖特征之间的遗传相关性.
- 为优化这一种群的育种策略提供见解.
主要方法:
- 通过使用最大限度限制概率程序安装了一种两种动物模型.
- 固定效应包括分娩数量和当代分娩组 (农场季节-年),牛年龄作为共变量.
- 估计了研究特征的遗传性和遗传相关性.
主要成果:
- 对MY305,CCI,NSC和CI的估计遗传率分别为0.21±0.05,0.03±0.028,0.02±0.024和0.06±0.04.
- 在MY305和生殖特征 (CCI,NSC,CI) 之间发现了积极和对抗性的遗传相关性,范围从0.32到0.99.
- 牛奶产量 (MY305) 表现出中等到低的遗传性,而生殖特征表现出非常低的遗传性.
结论:
- 仅仅针对乳产量进行选择可能会对洪都拉斯霍尔斯坦牛的生殖效率产生负面影响.
- 将生殖特征和永久性环境影响纳入育种计划对于长期,可持续的遗传改进至关重要.
- 需要平衡的选择策略来提高牛奶生产和生殖表现.
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