低能日粮中添加β-甘露聚糖酶对肉仔鸡生长性能及养分表观消化率的影响  

Effects of β-mannanase on Growth Performance and Apparent Nutrient Digestibility of Broilers Fed with Low Energy Diets

作　　者：赵娜[1] 韩苗苗[1] 龚利敏[1] 杨文军[1] 夏添[1] 吴卉[1] 张丽英[1] 

机构地区：[1]中国农业大学,动物营养学国家重点实验室,农业部饲料安全与生物学效价重点实验室,北京100193

出　　处：《中国畜牧杂志》2017年第11期61-65,共5页Chinese Journal of Animal Science

摘　　要：本试验旨在研究低能日粮中添加β-甘露聚糖酶对肉仔鸡生长性能及养分表观消化率的影响。选用648只1日龄AA肉仔鸡公雏,随机分为6个处理,每个处理6个重复,每个重复18只鸡。试验期42 d,分0~21 d和22~42 d 2个阶段饲养。试验基础日粮为玉米-豆粕型。6个处理组分别饲喂高能日粮(前期代谢能:12.55 MJ/kg;后期代谢能:12.97 MJ/kg)、低能日粮(前期和后期日粮的代谢能分别比高能日粮降低0.42 MJ/kg)以及在低能日粮基础上分别添加β-甘露聚糖酶300、400、500、1 000 mg/kg的日粮。结果表明:与低能组相比,添加β-甘露聚糖酶500、1 000 mg/kg处理组肉仔鸡22~42 d和0~42 d日增重显著提高(P<0.05),耗料增重比显著降低(P<0.05),且随添加量增加呈线性和二次变化(P<0.05);添加β-甘露聚糖酶500、1 000 mg/kg肉仔鸡饲料中干物质、粗蛋白质和总能的消化率与高能组无显著差异(P>0.05),且随着酶添加量的增加,饲料中粗蛋白质消化率呈线性增加趋势(P=0.04)。以试验全期平均日增重和耗料增重比为效应指标,采用单斜率折线模型分析,获得肉仔鸡日粮中β-甘露聚糖酶最佳添加量分别为529.5 mg/kg和503.2 mg/kg。综合生长性能和养分消化的结果,肉仔鸡日粮中β-甘露聚糖酶最佳推荐用量为500 mg/kg。An experiment was designed to study the effects of β-mannanase（CTCzyme） on growth performance and nutrient digestibility in broiler chickens fed with low energy corn soybean meal diets. A total of 648, one-day-old, male Arbor Acres broiler chicks were purchased and randomly allocated to six treatments with six replicates of eighteen chicks each. The experiment lasted 42 days which divided into starting phase（0-21 d） and finishing phase（22-42 d）. The trial basal diet was corn-soybean meal diet. The chickens were fed with high energy diets（metabolizable energy（ME）12.55 MJ/kg（starter） and 12.97 MJ/kg（finisher））, low energy control diets（ME12.13 MJ/kg（starter） and 12.55 MJ/kg（finisher））, and low energy control diets supplemented β-mannanase 300, 400, 500 and 1 000 mg/kg, respectively. The results indicated that during 22-42 d and 0-42 d, the average daily gain（ADG） and feed conversion ratio（F/G） significantly（P〈0.05） and linearly（P〈0.05） improved and decreased in chickens fed with diets supplemented β-mannanase 500 and 1 000 mg/kg in low energy diets, compared with low energy control diet group. Compared with high energy diet group, digestibility of dry matter, crude protein and gross energy had no significant differences in birds fed with β-mannanase 500 and 1 000 mg/kg in low energy diets（P〉0.05）. Moreover, digestibility of crude protein was linearly（P=0.04） increased with the increasing dosage of β-mannanase. The appropriate addition amount of β-mannanase was 529.5 and 503.2 mg/kg, based on singleslope polyline model of ADG and F/G during all period, respectively. Integrating the growth performance and nutrient digestibility, the optimum dosage of β-mannanase in broiler corn-soybean meal diets was 500 mg/kg.

关 键 词：Β-甘露聚糖酶 低能日粮 生长性能 养分消化率 肉仔鸡 

分 类 号：S831.5[农业科学—畜牧学]