晚期哺乳期奶牛中15N分区动力学的非线性模型来自单独标记的料成分
Kristan F Reed1, MaryGrace Erickson2, Tiago Barros2
1Department of Animal Science, Cornell University, Ithaca, NY 14850.
Journal of dairy science
|June 8, 2024
概括
(N) 动力学在奶牛料中不同. 像大豆粉和玉米谷物这样的缩料有利于牛奶的N分离,而像玉米和草料这样的料则将更多的N导入尿液. 身体N也对牛奶和尿液N有很大的贡献.
科学领域:
- 动物营养 动物营养
- 营养物质的新陈代谢
- 稳定同位素追踪 稳定同位素追踪
背景情况:
- 了解奶牛的 (N) 动力学对于优化营养和最小化环境影响至关重要.
- 之前的研究在使用稳定同位素技术检查单个料N分区方面存在局限性.
- 在常见的料成分中存在N分区和代谢的假设差异.
研究的目的:
- 量化和比较 (N) 动力学,包括分为牛奶和便,对于单个料成分.
- 为了确定乳母奶牛中不同料来源所驱动的代谢过程的速度.
- 为了区分牛奶和尿液之间的N分区,用于缩与料料.
主要方法:
- 使用稳定同位素 (15N) 追踪来标记单个料成分 (草料,玉米料,玉米粒,大豆粉).
- 给晚期哺乳期的奶牛 (n=12) 提供了四种不同的饮食,含有不同的标记成分.
- 在标签养96小时和养后80小时内采集了牛奶,尿液和便样本;使用非线性模型分析15N丰富.
主要成果:
- 便中的N排泄表明,大豆粉和玉米粒的消化能力高于和玉米料.
- 牛奶与尿液 (UN/MN比率) 的 (N) 分配为缩物 (大豆粉,玉米粒) 的≤1:1,有利于牛奶.
- 料料 (玉米和草料) 显示了UN/MN比率>1:1,表明更大的N分离到尿液中.
- 料N占便N的82.2%,但仅占尿液N的60.5%,牛奶N的57.9%,这表明体内N的贡献很大.
结论:
- 食N动力学和分区根据料来源 (缩与料) 有显著差异.
- 与料料相比,缩料在牛奶生产中被更有效地利用.
- 尿和牛奶的很大一部分来自体内内源的N来源,突显了N代谢的复杂性.
关键词:
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