乳头发酵和生长表现的变化在两个不同的时间点增加乳头不可降解蛋白后,在小牛的乳头发酵和生长表现的变化
Hamidreza Mirzaei-Alamouti1,2, Sahar Salehi1, Mehdi Khani3
1Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan 45371-38111, Iran.
Animals : an open access journal from MDPI
|March 28, 2025
概括
在小牛的初始饮食中切换到粉处理的大豆粉 (XSBM) 改善了奶时的生长性能和身高. 在28或42天的生命中用XSBM取代大豆粉 (SBM) 提高了断奶后的收益和料效率.
科学领域:
- 动物科学动物科学
- 乳制品营养 乳制品营养
- 动物生理学 动物生理学
背景情况:
- 母养殖的效率取决于为最佳生长提供及时的营养.
- 乳液不可降解蛋白 (RUP) 对于满足年轻反动物的蛋白质需求至关重要.
- 大豆粉 (SBM) 是一种常见的蛋白质来源,但其RUP含量可以被修改.
研究的目的:
- 为了评估切换到乳头不可降解蛋白质 (RUP) 源的时间对荷尔斯坦乳牛犊生长和乳头发酵的影响.
- 为了比较早期 (28日) 和晚些时候 (42日) 在小牛初始饮食中引入粉处理大豆 (XSBM) 的效果.
主要方法:
- 36只荷尔斯坦雌牛被分配到三个饮食组:从28日开始的SBM,从28日开始的XSBM或从42日开始的XSBM.
- 饮食在RUP含量上有所不同 (37%对48%),通过用XSBM取代SBM而实现.
- 牛犊被奶,在第60天被奶,并监测生长表现和反动物参数,直到第70天.
主要成果:
- 断奶后 (61-70天),食XSBM饮食 (XSBM28和XSBM42) 的小牛与SBM28组相比,每日养和养养比率显著增加.
- 加入XSBM增加了小牛的高度,在哺乳前和哺乳后.
- 在XSBM养的小牛中,乳头pH和丁酸盐度在断奶时较高,断奶后氨-N和总短链脂肪酸较低.
结论:
- 在断奶前期,通过在初始饮食中用XSBM取代SBM来增加RUP含量,可以提高断奶期间的生长性能.
- 在生命的42天内引入XSBM与在生长28天后引入XSBM一样有效,以改善生长结果.
- 在RUP供应中的饮食调整可以优化奶牛小牛的发育和表现.
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