关键词: 肉鸡, 复合酶, 饲粮营养水平

Abstract: A 2 factor D Satured optimization regression design were conducted to study the effect of Dietary Enzyme Preparation(E.P.) supplementation in low density diets with difference enzyme level on performance of broiler and nutrient utilization. 360 1 day old Avian male were used. The result shows that the density of diets and addition of enzyme are important factors affecting broiler performance. With the decrease of density of diet, Body Weight(BW) of broiler and Feed Conversion Rate(FCR) significantly decreases; The influence of enzyme level on performance and nutrient utilization is quadratic(except that to crude fat utilization). The addition of enzyme also improves the performance of broiler and utilization of nutrient with larger improvement in lower density diets than in normal diets. The optimal addition level of enzyme is 0.1%. The Apparent Energy Value(AEV) of enzyme is larger when used in lower density diets. When the density of diet decreases by 5.0%、8.02%、11.51%, with 0.1% enzyme addition, the AEV of enzyme is 343.2、451.2、586.5MJ/kg respectively. It is recommended that with the 0.1% addition of enzyme, the density of diet could decrease by about 5%.

Key words: BROILER, ENZYME PREPARATION, DENSITY OF DIETS