Sommer A, Pajtás M, Herceg J, Skultétyová N
Arch Tierernahr. 1975 Jul;25(5):365-77. doi: 10.1080/17450397509423200.
Recommendations are given saying that sugar-to-crude fibre rations of not more than 1.7:1 and sugar-to-urea ratios of 12:1 should be used in the fattening of cattle fed urea-supplemented rations of roughages in which 40% to 50% of the crude protein content of the ration had been replaced by urea. The amount of sugar per kg live-weight should not exceed 4 g. Higher quantities reduce the digestibility of crude fibre and, additionally, decrease the NH3 level and the pH in the rumen. At the same time the amount of volatile fatty acids is increased while the content of ruminal acetic acid decreases. Variations in the sugar-to-starch ratio had no statistically significant influence on the nitrogen balance whereas it was found that increasing quantities of sugar significantly decreased the digestibility of crude fibre. The proportional content of sugar in the readily metabolisable carbohydrates contained in the ration should not exceed 20% to 50%.
建议指出，在用尿素补充粗饲料日粮育肥牛时，糖与粗纤维的比例不应超过1.7:1，糖与尿素的比例应为12:1，其中日粮粗蛋白含量的40%至50%已被尿素替代。每千克活体重的糖含量不应超过4克。更高的量会降低粗纤维的消化率，此外，还会降低瘤胃中的氨水平和pH值。同时，挥发性脂肪酸的量会增加，而瘤胃乙酸的含量会降低。糖与淀粉比例的变化对氮平衡没有统计学上的显著影响，而发现糖量增加会显著降低粗纤维的消化率。日粮中易代谢碳水化合物所含糖的比例不应超过20%至50%。
