As production of cost-effective feed with minimal side effects on the environment is the main challenge in the feed industry, improving the bioavailability of nutrients, particularly phosphorous (P) is one way to approach these goals. This study was conducted to evaluate the effect of feed pretreatment with commercial exogenous enzymes on P releasing from phytate and assessing the bioavailability of P in feed under in vivo conditions. Three hundred and sixty-one-day-old male Ross 308 broilers were kept for 18 D. For pretreating, feeds were supplemented with one of three commercial enzymes and HCl 0.5% and heated at 40°C for 2 h. Body weight gain, feed intake, feed conversion ratio, bone indices, and phosphorus bioavailability were assayed. The results indicated that using commercial enzymes for pretreatment of feed had significant effects on feed intake, calcium (Ca), and P percentage of bone (P < 0.001); pretreatment also improved the bioavailability and absorption of P in intestinal digesta and feces. Therefore, it could be concluded that pretreatment of feed with 0.5% HCl and commercial enzymes is effective for increasing absorption and bioavailability of P, which could decrease excretion of phosphorous and, therefore, environmental pollution. In addition, feeding broilers with this treated feed might improve body weight and feed conversion ratio.

由于生产对环境的副作用最小成本效益的饲料是饲料行业面临的主要挑战，提高营养素的生物利用度，特别是磷（P）是接近这些目标的一种方式。进行这项研究以评估饲料中商业化外源酶预处理对植酸释放磷的影响，并评估体内磷在饲料中的生物利用度条件。将361天的雄性Ross 308肉鸡饲养18天。为进行预处理，在饲料中添加三种商业酶之一和0.5％的HCl，并在40°C加热2小时。测定体重增加，采食量，饲料转化率，骨指数和磷生物利用度。结果表明，使用商业酶对饲料进行预处理对饲料摄入量，钙（Ca）和骨磷百分比（P <0.001）; 预处理还改善了肠消化道和粪便中磷的生物利用度和吸收。因此，可以得出结论，用0.5％HCl和市售酶对饲料进行预处理可有效提高P的吸收和生物利用度，从而减少磷的排泄，从而减少环境污染。另外，用这种处理过的饲料喂养肉鸡可以改善体重和饲料转化率。