功能,但不是分泌,在布朗瑞士和霍尔斯坦奶牛之间有所不同
E C Kessler1, R M Bruckmaier1, J J Gross1
1Veterinary Physiology, Vetsuisse Faculty, University of Bern, CH-3012 Bern, Switzerland.
Journal of dairy science
|June 22, 2024
概括
由于脏功能较低,棕色瑞士奶牛的血尿含量比霍尔斯坦奶牛的血尿含量更高. 这项研究调查了这些品种之间的功能和分泌差异.
科学领域:
- 动物科学动物科学
- 兽医医学 兽医医学 兽医医学
- 乳牛生理学 乳牛生理学
背景情况:
- 与荷尔斯坦 (HO) 牛相比,棕色的瑞士 (BS) 牛自然具有更高的牛奶和血尿素度.
- 了解这些差异的生理基础对于奶牛群管理和代谢研究至关重要.
研究的目的:
- 测试 Brown Swiss 和 Holstein 牛在功能和分泌方面存在差异的假设.
- 为了比较BS和HO品种之间的膜过率 (GFR) 和尿素分泌标记物.
主要方法:
- 血液,唾液,尿液和便在相同的条件下从31只多的BS和46只HO奶牛收集.
- 在血清,尿液和唾液中测量了尿素,肌素和对称二甲基氨基素 (SDMA) 的度.
- 分析了便干物 (DM) 和含量;从DHIA记录中获得了牛奶尿素,蛋白质和产量数据.
主要成果:
- 与HO奶牛相比,BS奶牛的尿素,肌素和SDMA的血清度显著更高.
- 牛奶尿素度和蛋白质含量在BS奶牛中较高,但牛奶产量,便DM和便没有差异.
- 尿液和唾液中的尿素和肌素度在两种品种之间是相似的.
结论:
- 结果表明,与霍尔斯坦牛相比,棕色瑞士奶牛的球透率 (GFR) 更低.
- 在BS奶牛中降低的GFR有助于它们更高的血尿素度.
- 通过牛奶,尿液和便估计的排泄量可能不完全代表奶牛的整体循环.
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