性能测量有多大程度上可以解释牛之间的肠道甲变化?
Giulio Giagnoni1, Nicolas C Friggens2, Marianne Johansen1
1Department of Animal and Veterinary Sciences, AU Viborg Research Centre Foulum, Aarhus University, DK 8830 Tjele, Denmark.
Journal of dairy science
|February 4, 2024
概括
奶牛产生的肠道甲是一种温室气体. 研究人员发现,干物质摄入量 (DMI) 和二氧化碳 (CO2) 生产可以预测甲排放,简化了对低排放奶牛的选择.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 动物科学动物科学
背景情况:
- 乳牛产生的肠道甲 (CH4) 是人类造成的温室气体的重要贡献者.
- 选择低排放的奶牛是可能的,但需要更简单的,农场记录的性能测量,而不是直接监测气体排放.
研究的目的:
- 量化现有的绩效测量如何解释不同牛之间的甲产量的差异.
- 评估性能和气体测量对选择低甲排放乳牛的有用性.
主要方法:
- 利用了 149 头哺乳乳奶牛的 3 项实验的数据,使用线性混合模型来估计母牛之间的变化.
- 在性能 (例如,干物摄入量) 和气体测量 (例如,二氧化碳产量) 上进行了个别回归和主要组件分析/回归.
主要成果:
- 干物质摄入 (DMI) 解释了CH4产量的44%,而CO2产量解释了61%的变化.
- 结合措施增加了解释力 (R2高达0.66),但个人措施,如DMI或CO2被认为是足够的和简单的.
- 由DMI或CO2预测的剩余CH4被提出作为CH4效率的衡量标准.
结论:
- 个别性能指标,特别是DMI和气体指标,如二氧化碳产量,是乳牛甲排放的有价值预测指标.
- 使用单一,易于获得的措施简化了选择低排放的奶牛,避免了模型复杂性和过度装配.
- 剩余甲作为效率指标的概念需要进一步考虑.
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