描述基于特征的乳牛的DM摄入量分布类型
1Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California Davis, Tulare 93274, USA.
Animal : an international journal of animal bioscience
|July 14, 2023
概括
精密养奶牛通过考虑到个人干物质摄入量 (DMI) 的变化来提高效率. 这项研究表明,使用DMI的β分布模型与统一的养假设相比,可以显著减少养错误.
科学领域:
- 动物科学动物科学
- 乳制品营养 乳制品营养
- 农业工程 农业工程
背景情况:
- 目前的奶牛养实践往往根据个体的营养需求制定饮食,但以统一的方式养整个.
- 这种方法会导致效率低下和环境影响,原因是笔内个体干物质摄入量 (DMI) 的变化.
- 精密料旨在通过解决个体动物的需求来优化营养供应和资源利用.
研究的目的:
- 为了研究DMI在不同哺乳期和类型的奶牛中的分布形状.
- 根据最合适的分布形状,开发和验证总笔DMI的预测模型.
- 为了比较基于分布的DMI预测模型与统一的DMI料模型的准确性.
主要方法:
- 通过根据哺乳期周和体特征随机分类奶牛,生成模拟的奶牛.
- 将笔 DMI 数据与各种分布类型相配,以确定最适合的模型 (例如,β分布).
- 使用分布参数开发了一个预测模型,并将其百分比误差与假设均DMI的经验模型进行了比较.
主要成果:
- 牛的DMI被发现分布不正常,贝塔分布是最常见的最适合模型.
- 与统一养模型相比,分布形状模型显著降低了预测笔DMI总量的百分比误差 (<1%).
- 这表明,对DMI分布进行核算可以改善对群体的料量估计.
结论:
- 描述和利用笔内DMI的分布,可以比假设均摄入量提供更准确的料量估计.
- 基于分布的DMI预测的实施支持小组养奶牛的精密营养方法.
- 这种方法提高了养效率,并通过更好地满足群体实际营养需求,减少了对环境的影响.
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