直接养的细菌微生物混合物给食用终端饮食的肉牛提供的细菌微生物混合物对摄入量,营养消化能力,养行为以及反动物动力学/发酵概况的影响
Kaliu G Scaranto Silva1, Jhones O Sarturi1, Bradley J Johnson1
1Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX79409, USA.
Journal of animal science
|January 6, 2024
概括
直接养微生物 (DFM) 混合物没有改变牛肉牛的摄入量或养行为. 然而,一种特定的DFM混合物 (Treat-A) 改善了纤维消化能力,并促进了更健康的反动物环境,提高了营养利用率.
科学领域:
- 动物科学动物科学
- 类动物营养 类动物营养
- 微生物学 微生物学
背景情况:
- 直接养微生物 (DFM) 补充剂用于调节肠道微生物群并改善动物的表现.
- 了解不同DFM组合和比率对反动物生理学的具体影响,对于优化它们的应用至关重要.
研究的目的:
- 评估两种不同的细菌直接养微生物 (DFM) 混合物对牛肉牛的料摄入量,营养物质消化能力,养行为,反动物发酵和纤维降解动力学的影响.
- 为了确定特定的Lactobacillus animalis,Propionibacterium freudenreichii,Bacillus subtilis和Bacillus licheniformis的比例是否会影响食功能和营养代谢.
主要方法:
- 一个复制的3x3拉丁方形设计被用在六只口管的杂交的安格斯牛身上.
- 牛被以蒸汽片的玉米制成的终结者饮食,并分配给三个治疗之一:控制 (没有DFM),治疗-A (特定的DFM比率),或治疗-B (不同的DFM比率).
- 测量包括摄入量,消化能力,养行为,小体pH值,氨- (NH3-N),挥发性脂肪酸 (VFA),温度和现场纤维降解动力学.
主要成果:
- DFM治疗没有影响料摄入量或主要养行为.
- 接受Treat-A治疗的牛表现出增加的ADF消化能力和更有利的 ruminal pH 概况 (低于pH 5.6的时间更少,平均pH更高).
- 治疗-A补充剂导致NH3-N度更高,并倾向于降低食体温度,同时增加NDF和ADF的有效降解性,并倾向于增加半纤维素的降解性.
结论:
- 测试的细菌DFM组合没有影响牛肉牛的摄入或养行为.
- 含有较高比例的B. licheniformis (Treat-A) 的DFM混合物增强了核心纤维的消化能力,改善了小体pH参数.
- 处理-A似乎创造了一个更有利于纤维分量的可降解性和增加NH3-N可用性的反动物环境.
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