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Replacing soybean meal for wet brewer's grains or urea on the performance of lactating dairy cows

机译：用豆粕代替啤酒粉或尿素对泌乳奶牛的生产性能

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The purpose of this research was to evaluate the partial replacement of soybean meal (SBM) for wet brewer's grains (WBG) or urea on the performance of lactating dairy cows. The second investigated whether WBG ensiled with corn kept animal performance in low- and high-producing dairy cows compared with WBG. In experiment I, 40 Holstein cows were used in 4 x 4 Latin square design. The treatments comprised WBG or urea as partial replacement for SBM, as follows: control (diet based on SBM and 1 % of urea), 10 % of WBG, 20 % of WBG, and 2 % of urea. Dry matter intake (DMI) was not affected by treatments. WBG increased milk yield linearly, but it decreased with urea. Milk fat content responded quadratically to WBG levels. Milk protein content decreased, while plasma urea nitrogen increased with high urea addition. In experiment II, 42 Holstein cows were divided into two groups according to production levels. Eighteen cows composed the group of low producing, while the high-producing group comprised 24 cows. The experimental design was a crossover with two periods of 14 days. The experimental treatments consisted of feeding WBG or WBG ensiled with ground corn. Regardless of the production level, no difference in milk yield and milk composition between treatments was observed.
机译：这项研究的目的是评估在泌乳奶牛的生产性能方面，用豆粕（SBM）代替部分啤酒粉（WBG）或尿素的性能。第二个研究调查了用玉米粉刺的WBG与WBG相比在低产和高产奶牛中是否保持了动物性能。在实验一中，将40头荷斯坦奶牛用于4 x 4拉丁方形设计。处理包括WBG或尿素作为SBM的部分替代品，如下：对照（基于SBM和1％尿素的饮食），10％WBG，20％WBG和2％尿素。干物质摄入量（DMI）不受治疗的影响。 WBG线性增加牛奶产量，但随着尿素的增加而下降。牛奶脂肪含量对WBG水平呈二次响应。牛奶蛋白含量下降，而血浆尿素氮随高尿素添加量增加。在实验二中，根据生产水平将42头荷斯坦奶牛分为两组。低产组为18头母牛，高产组为24头母牛。实验设计是两个14天的交叉。实验处理包括喂养WBG或用磨碎的玉米碾碎的WBG。无论生产水平如何，在处理之间均未观察到牛奶产量和牛奶成分的差异。

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