Effects of different trace element contents on growth and slaughter performance of cage broilers with high dos-age of phytase
The aim of this experiment was to investigate the effects of different trace element contents on growth performance and slaughter performance of cage broiler hybrids supplemented with phytase at high dose.A total of 864 one-day-old cocks were randomly divided into 2 groups(control group supplemented with copper 10 mg/kg,iron 60 mg/kg,manganese 60 mg/kg,zinc 80 mg/kg,iodine 0.8 mg/kg,selenium 0.30 mg/kg,and experimental group supplemented with trace elements halved),with 8 replicates in each group and 54 chickens in each replicate.The test period was 50 days.The results showed that supple-mentation of 2 000 IU/kg phytase in the experimental group could significantly reduce the amount of trace elements in the diet(P＜0.01),improved the ratio of feed consumption to gain and daily gain of mixed meat chickens,but had no significant im-provement on daily feed intake of mixed meat chickens(P＞0.05).There were no significant differences in slaughtering rate,e-visceration rate,breast muscle rate and abdominal fat rate(P＞0.05).In conclusion,reducing the amount of trace elements in the diet under the condition of high dosage of phytase had no negative effect on the growth performance of cage broilers,and had obvious improvement on the ratio of daily weight gain and feed gain.
万方数据
维普
