【作者】 赵华；

【导师】 王康宁；

【作者基本信息】 四川农业大学 ， 动物营养与饲料科学， 2002， 硕士

【摘要】 为研究不同复合酶制剂对采食玉米-豆粕-副产物日粮肉鸡生产性能和养分利用率的影响，将630只1日龄健康艾维茵公雏随机分成7个处理，每个处理6个重复。其中对照组（A组）饲喂基础日粮，另外6个处理组B、C、D、E、F、G组为在基础日粮中分别添加0.75％编号为RD₁…RD₆的商品复合酶制剂，测定酶制剂添加对肉鸡生产性能的影响，并在42日龄从每个处理中抽取6只鸡进行屠宰试验。其中G组主要含淀粉酶和蛋白酶为主的消化酶，而B、C、D、E、F组为含非淀粉多糖酶（NSP酶）的多酶复合物，各单酶配伍和酶活不同。并在27日龄时用42只鸡进行代谢试验，测定酶制剂对饲料养分利用率的影响。试验结果表明：0-3周平均增重除B组外，其余加酶组与对照相比，都有不同程度的提高（提高1.34％-4.21％），其中G组效果最好，达到了显著水准（P＜0.05）。饲料转化率（FCR）各组间虽无显著差异，但加酶组有改善的趋势，每千克增重耗料降低2.78-3.98％。4-6周平均体增重以D组和E组最好，比对照组分别提高6.12％和5.66％（P＜0.05）。FCR以D组、E组和B组较好，比对照分别降低了5.63％、5.42％、5.17％（P＜0.05）。从全期看，加酶组增重均有不同程度改善，以E组和D组最好，比对照分别提高了4.39％和4.24％（P＜0.05）。FCR以D组和E组最好，分别较对照降低了4.69％、4.55％（P＜0.05）。对照组和各加酶处理组间在屠宰率（Carcass Weight ％ of BW），腹脂率（Abdominal fat % of Carcass）；胸肌率（Breast weight ％ of Carcass）均无显著差异（P＞0.05）。各加酶组都不同程度地提高了肉鸡的腿肌率，其中D组较对照组提高了11.34％，差异达到了显著水平（P＜0.05）。42日龄鸡只体重的均匀度，除C组外，其余各组都较对照组好，其中F组最好，显著优于对照组（P＜0.05）。除B组外，其余各加酶组与对照组相比，饲粮的AME都有提高的趋势，但差异不显著（P＞0.05）；N利用率（NPU）也是除B组外，其余各加酶组都不同程度地高于对照组，N利用率以F组、E组和D组较好，分别比对照组提高了7.18％、6.66％和5.72％（P＞0.05）。更多还原

【Abstract】 A 6-week experiment was conducted to investigate the effect of supplementing different enzyme cocktails in corn-soybean-byproduct diets on broiler chickens’ growth performance and nutrient utilization. 630 1-day-old Arbor Acre broiler chicks were randomly allocated to 7 experimental groups with 6 replicates. One acted as control group(A) and fed basal diet, another six treated groups were fed the basal diet supplemented with six different enzyme complexes, namely B (RD1), C (RD2), D (RD3), E (RD4), F (RD5), G (RD6), the supplementation level for each enzyme were 0.75Kg/t. At the same time, a metabolic trial was carried out on 42 birds at 27d .The results showed that ADG (average day weight gain) during 0-2Id in all enzyme complex supplementing groups, with the exception of group B, have been improved in some extent (1.34-4.21%). Among those, group G was the best (PO.05). FCR (feed conversion ratio) showed a decreasing tendency (2.78-3.98%) in enzyme supplementing groups, although there was no significant difference between treated group and control. During 22-42d, ADG of group D and group E were the best, which were 6.12% and 5.66% higher than control group(P<0.05 ), respectively. Group D, E and B had better FCR than other groups in this period, they were 5.63%, 5.42% and 5.17% higher than control group respectively (P<0.05) . In the whole experiment period, the ADG of all enzyme cocktails supplementing groups had been improved, among them group E and D was the best, which were increased by 4.39% and 4.24% (P<0.05) ; FCR in group D, E and B were better than other groups, they were decreased by 4.69% , 4.55% and 4.26% in contrast with control(P<0.05).There were no significant difference in broiler chicks carcass weight (% of weight), abdominal fat (% of carcass) and breast weight (% of carcass) between treated group and control (P>0.05) .All enzyme complexes supplementing groups have improved the thigh muscle ratio of birds, but only group D increased 11.34%, significantly (PO.05). With the exception of group B, AME of enzyme supplementing diets have an increasing tendency. However, there is no significantdifference (P>0.05 ); The NPU (net protein utilization) showed the same tendency as the AME, especially in diet F, E and D, which were 7.18%, 6.66% and 5.72% higher than control group respectively.更多还原