甲排放的遗传参数,料效率,养行为和肉牛生长特征
J A Silva1, J P S Valente1,2, L F M Mota2
1Beef Cattle Research Center, Institute of Animal Science, Sertãozinho, São Paulo, Brazil.
概括
通过遗传选择减少内罗尔牛的甲 (CH4) 排放是可能的,但必须管理与生长和料摄入等生产力特征的强烈遗传联系,以避免负面影响.
科学领域:
- 动物科学动物科学
- 遗传学 是一个遗传学.
- 环境科学 环境科学
背景情况:
- 气候变化需要减少温室气体排放,特别是来自牛肠发酵的甲 (CH4).
- 基因选择提供了一种可持续的缓解策略,但对尼罗尔牛等Bos taurus indicus品种的研究有限.
研究的目的:
- 为了估计内罗尔牛的CH4排放特征的遗传性和遗传相关性.
- 评估CH4排放,养行为,料效率和性能特征之间的关系.
- 评估对减少CH4排放的遗传选择的直接和相关反应.
主要方法:
- 在料效率试验中利用了2418头Nellore牛的数据.
- 测量特征包括干物质摄入量,养行为,养效率,平均每日增加和体重.
- 使用SF6追踪器技术量化甲排放,并通过贝叶斯推断通过单步基因组最佳线性无偏预测 (ssGBLUP) 分析数据.
主要成果:
- 对于CH4排放 (0.25) 和相关特征 (0.14-0.40用于性能,0.42-0.49用于养行为) 发现了中度的遗传概率估计.
- 在CH4排放和生产特征之间观察到高阳性遗传相关性 (DMI:0.79,ADG:0.90,MBW:0.91).
- 直接选择较低的CH4排放导致了温和的减排,但也与测试中期体重的相关下降有关.
结论:
- 尼罗尔牛的甲排放是遗传的,但与生产力有着强烈的遗传联系.
- 单独选择减少CH4排放可能会对料摄入量和动物表现产生负面影响.
- 考虑遗传相关性的综合育种策略对于减轻CH4排放而不会影响生产率至关重要.
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