NSP酶制剂对肉仔鸡生产性能和养分利用率的影响

Effects of NSP Enzyme Preparation on Production Performance and Nutrient Utilization Rate of Broilers

选用1日龄罗斯308肉仔鸡256只，随机分为4个组：1组饲喂玉米-豆粕型日粮，2组饲喂在1组日粮基础上降低代谢能0．21MJ／kg的日粮，3组饲喂“2组日粮＋200g／t酶制剂”，4组饲喂“2组日粮＋400g／t酶制剂”，研究NSP酶制剂对肉仔鸡生产性能和养分代谢的影响。结果表明：3、4组平均日增重、料重比均不同程度的优于2组；3、4组在42日龄时能量、干物质和粗蛋白质等养分代谢率也提高；4组的表观代谢能比2、1组分别提高了2．23％（P〈0．05）和0．98％（P〉0．05），真代谢能与2、1组相比分别提高了2．06％（P〈0．05）和0．89％（P〉0．05）；3、4组的营养物质代谢率与2、1组相比有1．5％－8．5％（P〈0．05）的改善幅度。

256 Ross 308 broilers with an age of 1 day were divided into 4 groups randomly ： Group 1 was fed on corn and soybean diets, Group 2 was fed on diets with reduced metabolic energy of 0.21 MJ/kg based on diets for Group 1, Group 3 was fed on ＂diets for Group 2 ＋ 200 g/t enzyme preparation＂ and Group 4 was fed on ＂ diets for Group 2 ＋ 400 g/t enzyme preparation＂ , to study the effects of NSP enzyme preparation on production performance and nutrient metabolism of broilers. The results indicated that average daily gain and feed - weight ratio of Group 3 and 4 were all superior to those of Group 2 ; the metabolic rates of energy, dry matter and crude protein were also increased in Group 3 and 4 at an age of 42 days ; the apparent metabolic energy in Group 4 was increased by 2.23% （P 〈 0.05） and 0.98% （P 〉 0.05） respectively compared to Group 2 and 1; the true metabolic energy was increased by 2.06% （ P 〈 0.05 ） and 0.89% （ P 〈 0.05 ） respectively compared to Group 2 and 1 ; the nutrient metabolic rates in Group 3 and 4 were improved by 1.5% -8.5% （P 〈 0.05） compared to Group 2 and 1.