转植酸酶基因玉米对肉仔鸡生长性能、胴体性能及肉品质的影响

试验旨在研究转植酸酶基因玉米代替非转植酸酶基因玉米添加到肉仔鸡日粮中对肉仔鸡生长性能、胴体性能及肉品质的影响。采用单因子完全随机设计,将160只1日龄AA肉仔公鸡分成2个处理组,每个处理组10个重复笼,每个重复笼8只鸡。对照组饲喂非转植酸酶基因的亲本玉米日粮,试验组饲喂转植酸酶基因玉米日粮,2个处理组鸡在试验期间饲喂的日粮中可利用磷等所有养分含量均相等或相近。试验期共42 d,分为1~21与22~42日龄2个饲养阶段。结果显示,试验组与对照组肉仔鸡各阶段的日增重、日采食量及料重比与42日龄鸡的胴体性能和多数肉质指标差异均不显著(P>0.05),而胸肌肉色(b*)、腿肌pH_{24 h}差异较显著(P<0.05),胸肌pH_{24 h}、腿肌肉色(b*)、剪切力、滴水损失差异极显著(P<0.01)。因此,试验期内转植酸酶基因玉米日粮对肉仔鸡生长性能、胴体性能和肉品质均未产生不良影响,初步说明转植酸酶基因玉米可完全替代普通玉米而用作肉仔鸡日粮的能量原料,且可降低无机磷的添加,从而减少肉鸡磷排出对环境的污染。

Effect of Phytase Transgenic Corn on Growth Performance,Carcass Traits and Meat Quality of Broilers

This experiment was conducted to research the effects of phytase transgenic corn (PTC) replaced of isogenic conventional corn (CC) on broilers diets. A single-factor completely randomized design was used. A total of 160 AA male broilers (one-day-old) were randomly allotted by body weight to two treatments (ten replicate cages of eight chickens per cage). Broilers of the control group were fed with CC diet,and broilers of the treatment group were fed with PTC diet. During the period of experiment,the concentrations of all nutrients (containing available phosphorus) in the diet of the two groups were equal. The experiment lasted for 42 days. The experiment had two phases (0 to 21 days and 22 to 42 days). The results showed that there were no significant differences in the average daily gain,average daily feed intake,or feed conversion ratio on each phase(P>0.05),and 42 d carcass traits and most indexes of meat quality between the control group and the treatment group(P>0.05).There were significant differences in the b* value of breast muscle and pH_{24 h} in leg muscle(P<0.05),and extremely significant differences in pH_{24 h} of breast muscle and b* value,shearing force,drip loss in leg muscle between the two groups(P<0.01). These results indicated that PTC diet had no more adverse effects on the above indicators than the control diet during the experiment period. Therefore,PTC could completely replace CC in using as energy raw materials in broilers diet,and decrease the amount of inorganic phosphorus and reduce environmental pollution.