Effect of transgenic phytase corn on growth performance and Ca-P metabolism in broiler
The effect of transgenic phytase corn on growth performance and Ca-P metabolism were investigated in broilers. 480 AA broilers (1-day-old) were divided into four treatments of three replicates each. The control group was fed CaHPO4 without phytase;the test groups were fed half of CaHPO4 ,test Ⅰ , Ⅱ and Ⅲ were fed 500 U/kg of exogenous phytase,500 U/kg and 750 U/kg phytase which was from transgenic phytase corn,respectively. The results showed that broilers' health status in each group were normal during the trial,there was no significant difference (P＞0.05) in the average daily gain and FCR (feed conversion rate) ;each group of calcium,phosphorus and nitrogen in serum and tibia was no significant difference (P＞0.05) ;the retention of phosphorus in faeces in test group at days 21 and 42 after treatment were lower than that of the control group by 49.43％ ,55.17％ ,54.02％ and 31.50％, 32.28 ％, 14.96 ％ respectively, which was significantly different (P＜0.01) ;there was no significant difference (P＞0.05) between transfer phytase corn group and the microbial phytase. Transgenic phytase corn as a source of phytase can replace the exogenous phytase in broiler diets,not only does not affect the production performance, but also can reduce the use level of CaHPO4 and N-P emissions.
NETL
NSTL
万方数据
维普
