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Replacing soybean meal for cottonseed meal on performance of lactating dairy cows

机译：代替棉籽粕的大豆膳食表演哺乳奶牛的表现

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Cottonseed meal (CSM) is an alternative source of protein, and previous studies have been shown that it can replace soybean meal (SBM) without decrease animal performance. However, Brazilian CSM has a different chemical composition compared with the usual CSM reported in the literature. The objective of this experiment was to evaluate the effects of replacing SBM for Brazilian CSM on performance and energy balance of mid-lactating dairy cows. Forty-two Holstein cows were used in a replicate 3x3 Latin square design. Increasing contents of CSM (0, 15, and 30 % of dry matter (DM)) were fed in diets to replace SBM. Milk yield and feed efficiency were linearly reduced with the replacement of CSMfor SBM(P=0.001). Milk fat content tended to increase quadratically (P=0.07) with CSM addition. Replacing SBM for CSM affected milk protein content quadratically (P=0.05). Milk urea nitrogen and plasma urea nitrogen (PUN) tended to respond quadratically (P=0.06 and 0.10) when CSM replaced SBM to the diets. Variation in body weight (BW) also responded quadratically as CSM replaced SBM (P=0.05). Altogether, the findings suggest better performance when cows receive SBM diet compared with the Brazilian CSM diet.
机译：棉籽粉（CSM）是替代蛋白质来源，并且已经表明它可以取代大豆餐（SBM）而不会降低动物性能。然而，与文献中报告的通常CSM相比，巴西CSM具有不同的化学成分。该实验的目的是评估替代SBM在巴西CSM上对中哺乳奶牛的性能和能量平衡的影响。四十二个荷斯坦奶牛用于复制3x3拉丁方形设计。增加CSM含量（0,15和30％的干物质（DM）以饮食喂养以取代SBM。用SBM更换CSMSMES（p = 0.001），乳屈服和饲料效率是线性的降低的。牛奶脂肪含量倾向于CSM加入二次增加（p = 0.07）。替代SBM用于CSM影响牛奶蛋白含量（P = 0.05）。当CSM取代饮食时，乳尿素氮和血浆尿素氮（PUM）倾向于二次（P = 0.06和0.10）。由于CSM替换SBM，体重（BW）的变化也在二次上响应（P = 0.05）。同时，当巴西CSM饮食相比，调查结果表明，当奶牛接受SBM饮食时，表现出更好的性能。

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