Abstract: 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.

Key words: phytase transgenic corn; broilers; growth performance; meat quality