在哺乳期的泽西奶牛中能量利用的动物间差异的分割
A L Carroll1, M L Spangler1, D L Morris2
1Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583.
Journal of dairy science
|June 2, 2024
概括
泽西牛如何利用能量的个体差异显著影响干物质摄入量 (DMI) 和甲能量损失. 了解这些动物的差异是优化奶牛能源使用的关键.
科学领域:
- 动物科学动物科学
- 营养生理学 营养生理学
- 乳牛的新陈代谢 乳牛的新陈代谢
背景情况:
- 动物之间的能量利用因饮食,遗传学和管理而异.
- 各个动物之间能量利用的差异很大,影响了牛奶生产的效率.
研究的目的:
- 量化泽西奶牛在能源利用中的动物间的差异.
- 分析这种差异如何影响不同的能源组件和效率.
主要方法:
- 利用来自15项研究的560个个体动物周期记录的间接热量计数据.
- 在SAS中使用GLIMMIX程序分析数据,包括动物,治疗,周期和实验的随机效应.
- 计算差异成分以确定归因于动物之间的差异的比例.
主要成果:
- 动物间的差异占干物摄入量 (DMI) 和能量分数 (GE,DE,ME,NEL) 的总差异的29.3%至42.5%.
- 当表达为每单位DMI时,便,尿道,热量和哺乳能量的动物间差异下降,但甲和组织能量增加.
- 能源效率 (DE/GE,ME/GE,ME/DE) 的差异较少由动物之间的因素 (平均值) 解释. 17.8%),而牛奶能量差异为28.8%.
结论:
- 乳牛的DMI和能量成分总变化的很大一部分是由于动物之间固有的差异造成的.
- 甲的能量损失显示出显著的变化,主要是由个体动物的差异驱动的,特别是当每单位DMI正常化时.
- 了解这些动物特异性变异对于提高料效率和减少乳制品养殖对环境的影响至关重要.
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