新生乳牛的血度不同:评估被动免疫转移的考虑因素
T A Westhoff1, R A Molano2, M E Van Amburgh2
1Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.
JDS communications
|December 9, 2024
概括
牛犊血度的变化会影响被动免疫评估. 调整血中总蛋白质的比例可以提高乳牛的被动免疫转移 (TPI) 评估的准确性.
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:
- 被动免疫转移 (TPI) 对小牛健康至关重要,并使用血清总蛋白 (TP) 进行评估.
- 血度或血体积的变化可能会影响TPI评估的准确性.
- 了解血度的变化对于可靠的乳母管理评估至关重要.
研究的目的:
- 量化霍尔斯坦小牛的血度和TPI变异性.
- 评估调整TP以血度对TPI分类的影响.
- 为了提高年轻乳牛的TPI评估的准确性.
主要方法:
- 分析了703只霍尔斯坦小牛 (1-9天大) 的TP和血比例 (PP) 的记录.
- 通过微血离心和TP使用数字折射计来确定PP.
- 在调整了PP的TP值后,重新评估了TPI类别.
主要成果:
- 观察到PP的显著变化 (平均68.8%,范围50.5%-86.0%),与第7天相比,第1天的PP较低.
- 调整TP为PP转移了TPI类别,特别是增加了TPI差 (+4.4%) 和公平TPI (+3.5%) 的小牛的比例.
- 在调整血度后,农场级的TPI分类也显示了转变.
结论:
- 在年幼的小牛中,血中的血比例非常可变,这会影响TPI评估.
- 调整血度的总蛋白质提供了更准确的TPI评估.
- 考虑到血度的变化对于准确的小牛和牛群水平TPI评估至关重要.
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