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补充反保护的阿尔金宁对过渡期牛的表现的影响
B Souza Simões1, M Nehme Marinho1, R R Lobo1
1Department of Animal Sciences, University of Florida, Gainesville FL 32611.
Journal of dairy science
|October 6, 2024
概括
补充牛奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶奶 这些好处持续超过了补充期,提高了奶牛的整体生产能力.
科学领域:
- 动物科学动物科学
- 乳制品营养 乳制品营养
- 生殖生理学 生殖生理学
背景情况:
- 氨酸是乳牛健康和生产力的关键氨基酸,特别是在过渡期.
- 补充策略旨在提高阿尔金因的可用性,以改善代谢状态和性能.
- 保护性氨酸 (RPA) 提供了一种方法来绕过的降解,并提供可代谢的氨酸.
研究的目的:
- 为了评估反保护性氨酸 (RPA) 补充剂对乳牛生产性表现的影响.
- 评估RPA对乳酪质量,牛奶产量和牛奶成分生产的影响.
- 调查RPA在补充期之外的延长益处及其对代谢参数的影响.
主要方法:
- 102只奶牛被分配到从怀孕250天到产后21天的控制 (CON) 或RPA补充组.
- 补充RPA增加了饮食中阿尔金因的含量,从可代谢蛋白 (MP) 的5.7%增加到7.5%.
- 测量了生产性能,乳酪和牛奶产量,IgG含量,以及血/牛奶代谢物.
主要成果:
- 用RPA养的奶牛产生的胆乳显著增加 (7.8比5.3公斤) 和IgG (746比526克).
- 牛奶产量 (34.9比32.8公斤/天),ECM产量 (40.9比37.8公斤/天) 和牛奶固体产量在RPA中增加.
- 补充后的好处延长了,每种消耗的DM增加了ECM产量,并增加了对母牛的ECM.
结论:
- 在过渡期中补充奶牛RPA可以提高乳酪产量和质量.
- 补充RPA对牛奶产量,ECM产量和牛奶固体产生积极影响,具有持久的益处.
- RPA影响肝脏中的氨基酸运输和尿素循环基因表达,有助于提高性能.
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