在植物性饲料中 ,磷主要以植酸及其盐的形式存在 ,而单胃动物缺乏分解植酸的植酸酶 ,故植酸磷基本上不能被单胃动物所利用[1] 。因此 ,必须在饲料中添加无机磷酸盐 ,这样不仅提高了饲料的成本 ,而且饲料中不能被利用的植酸磷排出体外 ,造成了环境的污染。大量的研究表明 ,在猪 In plant feed, phosphorus is mainly present in the form of phytic acid and its salts, whereas monogastric animals lack phytase to decompose phytic acid, so phytic acid phosphorus can hardly be utilized by monogastric animals [1]. Therefore, it is necessary to add inorganic phosphate to the feed, which not only increases the cost of the feed, but also can not be utilized in the feed to expel the phytic acid and cause environmental pollution. Numerous studies have shown that in pigs