使用氧气脉冲心率方法估计放牧奶牛活动的能源成本
Daniel Talmón1, Alejandra Jasinsky1, Federica Marin1
1Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Uruguay 12900.
Journal of dairy science
|April 13, 2025
概括
放牧的奶牛在放牧和休息时具有相似的氧气脉冲 (O2P),允许准确的能源成本测量. 放牧和走路的能源成本是可量化的,这解释了牧场养的奶牛更高的能源需求.
科学领域:
- 动物科学动物科学
- 乳制品生产 乳制品生产
- 能量代谢的能量代谢
背景情况:
- 由于环境和动物福利的原因,放牧乳制品系统受到青.
- 由于能源支出增加,放牧奶牛的料转换效率较低.
- 乳牛放牧的特定能源成本在很大程度上仍未得到量化.
研究的目的:
- 为了评估放牧对奶牛氧脉冲 (O2P) 的影响.
- 使用氧气脉冲心率 (O2P-HR) 技术量化乳牛放牧和行走的能源成本.
主要方法:
- 在休息和放牧后的奶牛中测量O2P (实验1).
- 使用O2P-HR技术测量与活动记录同步的热量产生 (HP) (实验1和2).
- 通过比较活动期间的HP与空/反活动期间的HP来计算放牧和行走的能源成本.
主要成果:
- 放牧相应地增加了心率和氧气消耗,保持了稳定的O2P.
- 放牧的能源成本在6.637.85kJ/kg^0.75/h之间.
- 走路的能量成本为24.03 kJ/kg^0.75/h. 这是一个非常好的结果.
- 在放牧和TMR养之间,每小时的能量消耗是相似的,放牧成本归因于食时间和步行.
结论:
- O2P-HR技术适用于估计放牧奶牛的能源消耗.
- 放牧和相关步行活动的能源成本解释了放牧系统中较低的料转化.
- 结果支持O2P-HR用于牧场牲畜的行为和能量研究.
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