诱导产前亚临床低血症的生理影响在多胞胎霍尔斯坦牛中
W S Frizzarini1, P L J Monteiro2, J P N Andrade3
1Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706.
Journal of dairy science
|February 12, 2026
概括
在乳牛中产前诱导亚临床低血症 (SCH) 主要的是 (Ca) 恒温机制. 这种初始化可能有助于奶牛更好地管理产后的Ca水平,尽管牛奶产量暂时下降.
科学领域:
- 兽医医学 兽医医学 兽医医学
- 动物科学动物科学
- 内分泌学 在内分泌学.
背景情况:
- 亚临床低血症 (SCH) 常见于周周的奶牛,这是由于对牛奶和母乳的高需求.
- 过渡性SCH可以激活反循环,增强 (Ca) 恒温.
- 了解产前SCH影响对于管理产后Ca平衡和牛奶生产至关重要.
研究的目的:
- 为了研究产前诱导性SCH对产前和产后Ca恒温的影响.
- 评估产前SCH诱导对乳母奶牛后期牛奶产量的影响.
- 评估对诱导的SCH和相关激素变化的耐药性的发展.
主要方法:
- 三十只多胎的荷尔斯坦牛在分娩前3-14天内接受了盐水 (CON) 或酸 (EGTA) 溶液的治疗.
- 每天和在输液期间和之后的多个时间点收集血液样本,以测量Ca,副甲状腺激素 (PTH) 和血清素.
- 牛奶产量每天记录一次,每周收集一次牛奶样本.
主要成果:
- 产前EGTA输液降低了电离化Ca (iCa) 和总Ca (tCa) 的度.
- 产后,接受EGTA治疗的奶牛表现出较高的iCa和tCa水平,并对诱导的SCH产生了耐药性.
- 接受EGTA治疗的奶牛产前和产后的PTH度发生了变化,并且往往具有更高的产前血清素水平;牛奶产量暂时减少,但整体上没有显著差异.
结论:
- 产前诱导的SCH启动了乳牛的Ca平静机制.
- 这种初始化可以改善分娩后的Ca平衡,并减轻低血症的影响.
- 需要进一步的研究才能充分了解对牛奶生产和牛健康的长期影响.
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