蛋白质在哺乳动物体内代谢产生氨 ,最终生成尿素 ,这两种物质也少量存在于它们的乳汁中。氨和尿素是乳汁中的非营养成分 ,含量过高甚至对饮用者的身体有害。但有不法之徒为提高掺水牛奶的蛋白质检测值 ,置消费者的健康于不顾 ,在向牛奶中掺水的同时 ,还加入铵盐或尿素等含氮物 The protein is metabolized in mammals to ammonia, which eventually produces urea, both of which are also present in small quantities in their milk. Ammonia and urea are non-nutritional components of milk that are too high and even harmful to the body of the drinker. However, some unscrupulous people in order to improve the protein detection value of water-added milk, set the consumer’s health careless, in the milk mixed with water, but also add ammonium nitrogen or urea nitrogen