在成长中的泽西公牛中推导维护能源需求
A L Carroll1, M J VandeHaar2, P J Kononoff1
1Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583.
Journal of dairy science
|April 30, 2025
概括
这项研究精确地测量了新泽西州年轻奶牛母牛的维护能源需求. 结果提供了维护净能量的最新估计,支持当前的模型,但建议略高要求.
科学领域:
- 动物科学动物科学
- 乳制品营养 乳制品营养
- 能量代谢的能量代谢
背景情况:
- 维护能源需求对于模拟动物生长至关重要,但最近还没有深入研究.
- 对长大的泽西小牛的维护能量的直接测量缺乏.
- 准确的维护能源估计对于乳制品动物的有效生长建模至关重要.
研究的目的:
- 通过间接热量计,估计在成长中的泽西公牛的维护能源需求和禁食热量产量.
- 为了比较从回归中获得的维护代谢能 (MEmaint) 与禁食热量生产的直接测量.
- 在奶牛养模型中提供精炼能源需求的最新数据.
主要方法:
- 在估计的维护水平上养了8只正在成长中的泽西公牛.
- 间接热量计被用来测量4天内产生的热量.
- 在96小时的禁食后测量了禁食热量产生,在最后2小时进行测量.
主要成果:
- 在维护摄入时的热量产生平均为9.55 ± 0.608 Mcal/d.
- 禁食热量产生被确定为6.56 ± 0.444 Mcal/d.
- 导出的维护能源需求是MEmaint = 0.157 ± 0.0056 Mcal/kg0.75/d和NEmaint = 0.108 ± 0.0051 Mcal/kg0.75/d,其能量转换效率 (kM) 为0.684 ± 0.0410.
结论:
- 该研究提供了新的直接测量新泽西养殖的维护能源需求.
- 估计的维护能源需求与当前NASEM (2021) 模型值保持一致,但略高于当前NASEM (2021) 模型值.
- 更新的数据可以提高乳牛的能量分区模型的准确性.
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