哺乳乳乳牛的能量和利用率越来越高,包括高蛋白加工玉米副产品
A L Carroll1, D L Morris2, M L Jolly-Beithaupt3
1Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583.
Journal of dairy science
|September 10, 2023
概括
高蛋白加工玉米副产品 (HPCoP) 可以在奶牛的饮食中取代大豆粉. 这项研究发现,HPCoP的含有支持了牛奶产量和增加了牛奶脂肪度,而不会影响干物质摄入量或营养物质消化能力.
科学领域:
- 动物科学动物科学
- 乳制品营养 乳制品营养
- 料技术 料技术 料技术
背景情况:
- 玉米干乙醇生产产生了一种高蛋白副产品 (HPCoP).
- HPCoP含有大约52%的原始蛋白质 (CP) 和36%的中性清洁剂纤维 (NDF).
- 豆是乳牛常见的蛋白质补充剂.
研究的目的:
- 评估用HPCoP替代非酶化色大豆粉的效果.
- 评估对干物质摄入量 (DMI),能量和利用以及哺乳期泽西奶牛的牛奶产量的影响.
主要方法:
- 一个4x4拉丁方形设计,在四个28天的时间段内,有12只多夫妇的泽西牛.
- 牛被养的饮食含有0%,2.6%,5.4%,或8.0%的HPCoP在干物质的基础上.
- 饮食是异的,HPCoP在缩混合物中取代了大豆粉.
主要成果:
- 包括HPCoP并没有影响DMI,但倾向于增加牛奶产量.
- 随着HPCoP的加入,牛奶脂肪度线性增加;牛奶蛋白度保持不变.
- 干物质,NDF,CP,总脂肪酸和总能量的消化能力没有受到影响.
- 饮食总能量线性增加,而可消化和代谢的能量保持不变.
- 哺乳期的净能量 (NEL) 倾向于增加,NEL:ME比率线性增加.
结论:
- 在哺乳乳奶牛的饮食中,HPCoP可以有效地替代非酶化色的大豆粉.
- HPCoP支持正常的牛奶生产,有利的趋势是增加牛奶脂肪.
- 进一步的研究可以探索最佳的包容率和长期影响.
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