给限量养的奶牛养石灰石缓冲剂,养的奶牛中含有蒸器谷物的含量很高
Lydia K Olagunju1, David P Casper2,3
1Dairy Science Department, South Dakota State University, Brookings, SD 57006, USA.
Translational animal science
|October 8, 2024
概括
用高蒸剂含有可溶性谷物 (DDGS) 的低缓冲纳入率养乳牛可以提高料效率,而不会影响生长. 这项研究发现,低碳酸缓冲剂在限量食量中提高了性能.
科学领域:
- 动物科学动物科学
- 类动物营养 类动物营养
- 牛奶牛的养 牛奶牛的养
背景情况:
- 在乳牛的饮食中含有可溶性蒸器谷物 (DDGS) 的高含量率可能会导致皮皮状况不佳.
- 饮食缓冲剂通常用于减轻与高谷物饮食相关的低肠pH值.
- 在高DDGS饮食中,碳酸盐 (CaCO3) 等缓冲剂的最佳含量需要进一步研究.
研究的目的:
- 为了评估不同食石灰石缓冲物含量率对生长中的奶牛中营养物质消化能力和分泌的影响,养高DDGS量.
- 为了测试这样的假设,即更高的石灰岩缓冲含量会在限量养,高DDGS的饮食中抵消低 rumen pH.
- 为了确定缓冲物包含在生长表现,料效率和乳头发酵参数上的影响.
主要方法:
- 一项交叉设计研究,涉及5只在2周内经过小吃管的霍尔斯坦和布朗瑞士公牛.
- 两个治疗组:一个高的CaCO3缓冲含量 (0.80%) 和一个低的CaCO3缓冲含量 (0.25%) 在40%的DDGS饮食中,限制在2.50%的体重 (BW).
- 液收集用于pH,氨-N和挥发性脂肪酸 (VFA) 分析;便样本用于全道营养物质消化能力评估.
主要成果:
- 在治疗之间,框架增长,体重 (BW) 或平均每日增长 (ADG) 没有显著差异.
- 用低缓冲量养的小牛表现出较低干物质摄入量 (DMI) 的趋势,并提高了料效率 (gain:feed,P < 0.01).
- 在高缓冲区组 (P < 0.01) 中观察到较高的反氨-N 和异酸盐度,反氨pH或其他VFA没有差异.
结论:
- 假设被拒绝了;低碳酸缓冲含率提高了限量养,高DDGS配给的料效率.
- 限制养的高DDGS饮食与低缓冲器含量率提高了料效率,同时保持了生长乳牛的生长性能.
- 饮食缓冲水平可以优化,以提高DDGS基料的料效率,而不会显著地对生长或皮的pH产生负面影响.
关键词:
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