“溶浸”法提取大豆油,大豆在加工过程中只能加热到50～60℃,最后回收溶剂时,蒸汽温度虽然可达到100℃,但时间很短,不能完全破坏豆粕里的残留尿素酶。牲畜食用这种豆粕后,会影响体内尿素酶的活性,抑制蛋白质的分解、消化和吸收转化,容易引起牲畜腹泻。尿素酶还能催化水解尿素,放出大量的二氧化碳和氨,部分氨进入血液,提高血氨浓度 “Leaching” method to extract soybean oil, soybeans in the process can only be heated to 50 ~ 60 ℃, the final recovery of solvent, although the steam temperature can reach 100 ℃, but the time is very short, can not completely destroy the residual urease in soybean meal . Livestock eating this soybean meal, will affect the body’s activity of urease, inhibit protein decomposition, digestion and absorption of conversion, easily lead to livestock diarrhea. Urease can also catalyze the hydrolysis of urea, emit large amounts of carbon dioxide and ammonia, part of the ammonia into the blood, improve blood ammonia concentration