补充不同来源的非蛋白质对食类发酵,营养消化能力和微生物蛋白质合成的影响在食用基于玉米料的肉牛中
Juan de J Vargas1,2, Federico Tarnonsky1, Araceli Maderal1
1Department of Animal Sciences, North Florida Research and Education Center, IFAS, University of Florida, Marianna, FL, USA32446.
Journal of animal science
|August 14, 2025
概括
用新的非蛋白质 (NPN) 混合物补充生长的牛,如尿素-酸盐 (UB) 和尿素-酸盐-酸盐 (UBN),可以改变乳头发酵和营养消化能力. 在这项研究中,这些NPN来源并没有影响微生物的外流或效率.
科学领域:
- 动物科学动物科学
- 类动物营养 类动物营养
- 农业化学 农业化学
背景情况:
- 非蛋白质 (NPN) 补充剂增强了反动物可降解蛋白质,改善了反动物的发酵和微生物生长.
- 评估新的NPN来源对于优化反动物的饮食和表现至关重要.
研究的目的:
- 评估与尿素 (U) 相比,尿素-酸盐 (UB) 和尿素-酸盐-酸盐 (UBN) 混合物的尿素-酸盐 (UBN) 混合物对生长牛中的小肠发酵和微生物 (N) 流出的影响.
- 调查这些NPN来源对营养摄入量,消化能力和消化道通道速率的影响.
主要方法:
- 一个复制的3x3拉丁方形设计实验,涉及12只正在成长的小牛养基于玉米料的饮食.
- 补充了尿素 (U),尿素-酸盐 (UB) 或尿素-酸盐-酸盐 (UBN) 在相当的N水平.
- 测量包括料摄入量,营养物质消化能力,液参数,血液代谢物,消化器流量和微生物N外流.
主要成果:
- 补充了UB的牛往往比使用UBN的牛消耗更多的干物质 (DM) 和有机物质 (OM).
- 与U和UB相比,UBN补充剂导致了较大的全道酸洗纤维 (ADF) 消化能力和较低的类氨度.
- 在治疗方法之间没有观察到微生物N外流,微生物效率或总挥发性脂肪酸 (VFA) 度的显著差异.
结论:
- 新型NPN混合物,特别是UBN,可以修改反动物发酵特性,例如降低氨水平,而不会对微生物蛋白质合成产生负面影响.
- 这些发现表明,有可能利用新的NPN来源来微调生殖牛的生殖环境和营养利用.
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