综述:牛群中饮食中,和供应的恒常性边界
1Trouw Nutrition R&D, Amersfoort, the Netherlands.
概括
牛可以调整它们对,铜和等食微量矿物质的吸收. 了解它们的恒常性极限可以防止缺陷和毒性从补充.
科学领域:
- 动物营养 动物营养
- 微量矿物质的新陈代谢
- 在畜牧业的恒常状态.
背景情况:
- (Zn),铜 (Cu) 和 (Mn) 的食补充在牛中很常见.
- 目前的补充水平可能超过安全限度,可能损害动物健康和生产力.
- 现有的饮食建议使用简化的吸收系数,限制精确的补充策略.
研究的目的:
- 审查关于牛对不同微量矿物质供应的恒常适应的证据.
- 为了确定在牛中微量矿物质平衡的下限和上限.
- 通过考虑平静调节,为更准确的补充实践提供信息.
主要方法:
- 总结关于牛的明显吸收效率的定量数据.
- 分析特定营养物质对低和高饮食微量矿物质摄入量的恒常适应.
- 估计微量矿物质恒温的下限和上限.
主要成果:
- 牛在调整明显的吸收效率以适应食供应方面表现出显著的恒温能力.
- 铜 (Cu) 和 (Mn) 似乎比 (Zn) 更容易受到营养挑战.
- 干物质摄入量显著影响微量矿物质过载风险,特别是在哺乳期的奶牛中.
结论:
- 微量矿物质吸收中的恒温适应是复杂的,并且取决于状态.
- 确定下部和上部饮食供应边界对于防止缺陷和过剩至关重要.
- 将重点转移到每日微量矿物质摄入量,而不是仅仅是度,可以改善充分性评估.
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