饲用甘露聚糖酶转基因玉米对肉鸡生长性能、屠宰性能及血清生理生化指标的影响

摘要

本试验旨在研究甘露聚糖酶转基因玉米对肉鸡生长性能、屠宰性能及血清生理生化指标的影响。试验选择1日龄爱拔益加（ AA）肉鸡480只，随机分成4个组，每组6个重复，每个重复20只鸡。4个组安排如下：组Ⅰ为非转基因玉米的对照组，不添加甘露聚糖酶；组Ⅱ为非转基因玉米添加低剂量微生物来源甘露聚糖酶组，甘露聚糖酶活力500 U／kg；组Ⅲ为低剂量甘露聚糖酶转基因玉米组，甘露聚糖酶活力500 U／kg；组Ⅳ为高剂量甘露聚糖酶转基因玉米组，甘露聚糖酶活力5000 U／kg。试验期42 d。结果表明：与对照组相比，组Ⅲ和Ⅳ42日龄肉鸡平均日增重有显著提高（ P＜0．05），组Ⅳ料重比显著降低（ P＜0．05）。组Ⅳ42日龄肉鸡屠宰率和全净膛率显著高于组Ⅱ和对照组（ P＜0．05）。组Ⅱ、Ⅲ和Ⅳ21和42日龄肉鸡的血液生理生化指标与对照组均没有显著差异（ P＞0．05）。由此可见，饲粮中添加甘露聚糖酶转基因玉米能提高受试肉鸡的生长性能和屠宰性能，但对血液生理生化指标没有显著影响。%This experiment was conducted to investigate the effects of mannanase transgenic corn on growth performance, carcass performance and blood physiological and biochemical indexes of broilers.A total of 480 one-day-old Arbor Acres ( AA) broilers were randomly allocated to 4 groups, with 6 six replicates per group and 20 broilers per replicate.The four groups showed as follows: group Ⅰ, broilers fed non-transgenic corn without addition of mannanase as the control; group Ⅱ, broilers fed non-transgenic corn with addition of mi-crobial mannanase at low dosage of mannanase activity ( 500 U/kg);groupⅢ, broilers fed mannanase trans-genic corn with low dosage of mannanase activity (500 U/kg); and group Ⅳ, broilers fed mannanase trans-genic corn with high dose of mannase activity ( 5 000 U/kg) .The trial lasted for 42 d.The results showed that the average daily gain of broilers aged of 42 days in groups ⅢandⅣwas significantly higher and the ratio of feed to gain was significantly lower than those in control group (P<0.05).Slaughter percentage, eviscerated percentage of broilers aged of 42 days in group Ⅳwere significantly higher than those in groupⅡand control group( P<0.05) .No significant differences were observed among the 4 groups in blood physiological and bio-chemical indexes (P>0.05).It is concluded that diet added mannanase transgenic corn can significantly im-prove the growth and carcass performance of broilers, while has no significant effects on the blood physiologi-cal and biochemical indexes.