德国和荷兰蛋白质评价体系在不同蛋白质水平分级日粮中应用的比较

T. Ettle, F. Schwarz
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引用次数: 2

摘要

采用荷兰(DVE)和德国(nXP)蛋白质评价体系,对四项专门设计的奶牛饲养试验数据进行了比较。比较的标准是用各自的蛋白质评价体系预测和观察到的奶蛋白产量之间的差异。每组试验分别饲喂红三叶草/草甸草、草甸草、草青贮和玉米青贮。为了实现多样化的数据库,每个实验提供2或3个不同水平的蛋白质。在所有测量数据中,两种蛋白质评估系统有时导致预测和观察到的蛋白质产量之间存在相当大的差异。观察到的产量被高估了223克每头奶牛和天与DVE系统和144克每头奶牛和天与nXP系统。偏差的大小取决于日粮的类型。在新鲜饲料的实验中,DVE系统的预测和观察到的奶蛋白产量之间的差异远远大于nXP系统的计算结果(差值为322 g对162 g)。而饲喂草青贮后,两种蛋白质评价体系之间的差异很小(194 g对182 g)。在饲喂玉米青贮的实验中,预测值与DVE和nXP体系的观测值接近(相差48 g对80 g)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of the German and the Dutch protein evaluation system in dairy nutrition when applied to different rations with graded protein levels
The Dutch (DVE) and the German (nXP) protein evaluation system were compared using data from four specially designed dairy feeding trials. The criterion for comparison was the divergence between predicted and observed milk protein yield with the respective protein evaluation system. Different forages were fed in each series of experiments, namely red clover/meadow grass, meadow grass, grass silage and maize silage, respectively. To achieve a diversified database, protein was supplied at 2 or 3 different levels in each experiment. Across all measured data, the two protein evaluation systems resulted sometimes in considerable differences between predicted and observed protein yield. The observed yield was overestimated by 223 g per cow and day with the DVE system and by 144 g per cow and day with the nXP system. The magnitude of the bias varied depending on the type of ration fed. In experiments with fresh forage the difference between predicted and observed milk protein yield was far greater with the DVE system than that calculated with the nXP system (difference 322 g vs. 162 g), whereas after feeding grass silage the differences between the two protein evaluation systems were small (194 g vs. 182 g). In experiments with maize silage the predicted value was close to the observed value both with the DVE and the nXP system (difference 48 g vs. 80 g).
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