对奶牛3 - 氧醇补充剂的哺乳性能影响:一个元回归
L F Martins1, M Maigaard2, M Johansen2
1Department of Animal Science, The Pennsylvania State University, University Park, PA 16802.
Journal of dairy science
|January 23, 2025
概括
在奶牛中补充3-氧醇 (3-NOP) 减少了干物质摄入量和牛奶产量,但增加了牛奶脂肪和真正的蛋白质. 这些影响与食发酵的变化有关,剂量和饮食成分影响结果.
科学领域:
- 动物科学动物科学
- 类动物营养 类动物营养
- 乳牛生产 乳牛生产
背景情况:
- 3-氧醇 (3-NOP) 是一种被研究的料添加剂,其潜力是调节乳头发酵并提高奶牛的性能.
- 了解3-NOP的生产效应和影响因素对于优化其在乳制品饮食中的应用至关重要.
研究的目的:
- 进行元回归,分析3-NOP在奶牛的生产效应.
- 调查3 - NOP补充剂与剂量,饮食成分和补充时间等因素之间的关联.
主要方法:
- 一个元回归分析,包括来自21项研究 (2014-2024) 的40项治疗对照比较.
- 响应变量包括DMI,牛奶产量,ECM产量,料效率,体重和牛奶成分度.
- 解释变量包括3-NOP剂量,料与度的比率,CP,提取物,NDF,粉,补充时间,以及奶牛的DIM和BW.
主要成果:
- 3-NOP补充剂数量减少了DMI (-0.80公斤/天) 和My (-0.98公斤/天),但增加了ECM料效率 (+0.05公斤ECM/公斤DMI).
- 牛奶脂肪 (+0.09%),真正的蛋白质 (+0.02%) 和 MUN (+0.59 mg/dL) 的度增加.
- 更高的3-NOP剂量降低了DMI,增加了牛奶脂肪和MUN;饮食NDF,FC和CP调节了这些效应.
结论:
- 在奶牛中补充3-NOP可以降低DMI和MY,但由于增强的牛奶脂肪和真正的蛋白质,可以保持或改善能量校正牛奶 (ECM).
- 转发酵的变化,包括增加的pH和酸盐,可能解释了观察到的牛奶成分反应.
- 饮食调整和剂量优化是最大限度地发挥3-NOP.的好处的关键.
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