配料颗粒大小对高产 (荷尔斯坦) 奶牛的消化但不是生产参数的影响不同,与低产 (吉罗兰多) 奶牛相比
Rafael Sandin Ribeiro1, Abias Santos Silva2, Jaciara Diavão2
1Department of Biosystems and Engineering, Federal University of São João del-Rei, São João del-Rei, MG, Brazil.
The Journal of dairy research
|May 6, 2024
概括
饮食颗粒大小显著影响奶牛的摄入量和营养消化能力,有品种特定的反应. 荷尔斯坦牛的甲强度较低,而吉罗兰多牛的摄入量和消化能力根据食长度而异.
科学领域:
- 动物科学动物科学
- 营养生理学 营养生理学
- 环境科学 环境科学
背景情况:
- 奶牛的生产力和环境影响受饮食成分的影响.
- 了解特定品种对料颗粒大小的反应对于优化营养和减少排放至关重要.
研究的目的:
- 评估混合料总颗粒大小 (短与长) 和牛品种 (荷尔斯坦与吉罗兰多) 对摄入动态,动物表现和甲 (CH4) 排放的影响.
- 为了比较高产荷尔斯坦和低产吉罗兰多奶牛,关于它们对食颗粒大小的反应.
主要方法:
- 一个2x2拉丁方形交叉设计,有两个饮食 (短颗粒大小,SPS;长颗粒大小,LPS) 和两个品种 (霍尔斯坦,吉罗兰多).
- 数据收集包括两次26天的摄入动态,消化能力,动物表现,牛奶成分,甲排放量和类发酵参数.
主要成果:
- 颗粒大小没有影响过渡速率,NDF消化能力,性能,牛奶成分或牛发酵.
- 吉罗兰多牛在SPS饮食中增加了干物质摄入量 (DMI),而霍尔斯坦牛没有显示任何变化. 霍尔斯坦用LPS提高了干物质的消化能力,而吉罗兰多斯则降低了.
- 减少颗粒大小增加了两种品种的CH4强度,霍尔斯坦牛的CH4强度总体较低.
结论:
- 在荷尔斯坦和吉罗兰多奶牛之间,饮食颗粒大小对DMI和营养消化能力的影响不同.
- 虽然颗粒大小没有影响牛奶产量或成分,但它影响了CH4强度,较短的颗粒大小增加了它.
- 品种差异对于确定对饮食颗粒大小的反应至关重要,影响营养物质利用率和甲生产效率.
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