产前尿液pH与多胎牛的周周血度之间的关联
Jesse P Goff1, Pedro Melendez2, Julian A Bartolome3
1Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States.
Frontiers in veterinary science
|September 5, 2025
概括
乳牛分娩前的酸性饮食可以改善 (Ca) 稳定性. 对于大多数奶牛来说,产前尿液pH值低于7.75是有益的,而老年奶牛可能需要更具体的尿液pH值范围以达到最佳的Ca水平.
科学领域:
- 食动物的营养和新陈代谢
- 乳牛生理学
- 矿物质稳态
背景情况:
- 乳牛产前代谢性,通常由饮食中的酸盐诱导,对 (Ca) 稳态有负面影响.
- 饮食离子补充剂可以通过使尿液酸化来减轻性,这是血液pH的实际指标.
- 改善周产期Ca状态的最佳产前尿液pH值尚未确定.
研究的目的:
- 确定产前尿液pH与产后血液Ca度之间的关系.
- 确定产前尿液的目标pH值范围,以优化血液中的Ca nadir并减少亚临床低血症 (SCH).
- 分析这些关系的基础上.
主要方法:
- 在9项研究中对660头多头牛产前尿液pH和产后血液Ca数据进行分析.
- 在六个预定义的尿液pH值中计算最小平方值为血中最低的Ca度 (Ca nadir).
- 对所有奶牛的数据进行统计分析,并按平价分层.
主要成果:
- 在所有奶牛中,尿液pH值≥7. 76是最低的Ca值,也是亚临床低血症 (SCH) 的最高发病率.
- 在所有牛或第二和第三等值牛的尿液pH< 7. 75时,平均Ca nadir增加,而在尿液pH< 7. 75时,Ca nadir或SCH发生率没有显著差异.
- 在4平度或更高的奶牛中,尿液pH值在6. 26至6. 75之间,与尿液pH值> 7. 25或< 5. 75相比,产生显著更高的Ca值.
结论:
- 建议在分娩前的尿液pH值低于7.75,以提高第二和第三等值的奶牛的血液Ca nadir.
- 在4等或更高的奶牛中,最佳酸盐度与5. 75至7. 25之间的尿液pH相关,而低于5. 75的值与较低的酸盐度相关.
- 产前尿液pH管理是一种可行的策略,可以改善围产奶牛的Ca稳态,并考虑具体的平价值.
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