产后2天血液度的知识是否会影响补充的决定?
H A McCray1, C R Seely2, J A A McArt2
1College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.
JDS communications
|April 22, 2024
概括
延迟口服补充可能有利于低血的奶牛. 在牛奶 (DIM) 中2天诊断亚临床低血症 (SCH) 并没有改变4DIM的血水平,但支持3头牛的平等牛奶产量.
科学领域:
- 兽医医学 兽医医学 兽医医学
- 动物科学动物科学
- 类动物营养 类动物营养
背景情况:
- 乳牛的亚临床低血症 (SCH) 与负面的健康和生产结果有关.
- 早期识别受益于 (Ca) 补充的奶牛对于群体管理至关重要.
- 在牛奶中4天的血液总 (tCa) 度 (DIM) 是一个关键指标.
研究的目的:
- 确定在2DIM诊断SCH是否可以指导2和3DIM口服Ca补充的决策.
- 评估SCH诊断和Ca补充剂对牛奶产量和血液Ca4 DIM的影响.
- 分析基于平价和2 DIM的Ca状态的效应.
主要方法:
- 来自一项涉及518头多头母牛的随机对照试验数据的分析.
- 奶牛被分配到对照 (没有Ca) 或玻尿酸 (口服Ca在2和3DIM) 组.
- 用通用线性混合模型来定义2 DIM的SCH值,并分析4 DIM的牛奶产量和tCa.
主要成果:
- 在亚临床低血症治疗 (SCHTRT) 组之间,牛奶产量在平价2和3的奶牛之间有所不同.
- 有SCH的平价2奶牛 (无论治疗方式如何) 产生的牛奶比正常血的奶牛多.
- 获得延迟卡补充剂的平价3奶牛的产量比对照群的产量更多,不管它们的2DIM卡状态如何. 4 DIM的血液Ca在不同组中是相似的.
结论:
- 与对照人群相比,延迟口服卡博洛斯的服用并没有改善血中卡博洛斯度的4 DIM.
- 这种补充策略支持增加平价3头奶牛的牛奶产量,无论它们最初的Ca状态是2 DIM.
- 对2DIM的血液Ca的了解可能不必指导对等3奶牛的Ca补充决策.
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