补充来源对哺乳期荷尔斯坦奶牛明显和真实的吸收,保留,性能和状况的影响
K M Cruickshank1, B Hatew2, A M Gehman3
1Department of Animal Biosciences, Ontario Agricultural College, University of Guelph, Guelph, ON, Canada N1G 2W1.
Journal of dairy science
|March 9, 2024
概括
有机与无机相比,在奶牛中增加了牛奶的度并减少了尿液分泌. 然而,来源并没有影响牛的表现,状态或补充水平的吸收.
科学领域:
- 动物科学动物科学
- 营养生物化学 营养生物化学
- 微量矿物质的新陈代谢
背景情况:
- 是乳牛健康和生产力的重要微量矿物质.
- 饮食中的生物可用性因其化学形式 (有机与无机) 而有很大差异.
- 了解源效应对于优化奶牛营养和最小化环境影响至关重要.
研究的目的:
- 研究有机 (化酵母) 与无机 (化) 来源对奶牛性能的影响.
- 为了评估源对哺乳期荷尔斯坦奶牛状态,保留和吸收的影响.
- 根据食源来确定分泌途径 (便,尿道,牛奶) 的差异.
主要方法:
- 二十四只多的荷尔斯坦牛被分配给补充有机或无机的饮食.
- 用同位素标记物 (77Se和82Se) 来测量吸收和保留.
- 测量包括干物质摄入量,牛奶产量,牛奶和血清度,以及便,尿液和牛奶分泌量的定量分析.
主要成果:
- 与无机相比,有机补充剂的牛奶度更高.
- 在被养有机的奶牛中,液77Se水平更高.
- 两种来源之间在明显的吸收,真实吸收,保留或动物整体表现方面没有发现显著差异.
结论:
- 有机补充剂提高了牛奶的度,减少了尿路分泌,这表明更有利的环境状况.
- 在测试的补充水平 (0.3 mg Se/kg DM),来源没有影响奶牛的性能,状态或吸收效率.
- 进一步的研究可能会探索乳牛的最佳补充水平和不同的有机形式.
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