Effects of Dietary Cu-Zn Reduction on Growth Performance and Fecal Cu-Zn Contents in Dumei Growing Pigs
To investigate the effects of dietary Cu-Zn reduction on the growth performance and contents of fecal Cu and Zn in growing pigs,a total of 224 Duroc×Meishan(Dumei)crossbred pigs were randomly divided into two groups in this study.The control group were fed the basal diet supplemented with 60 mg·kg-1 Cu and 100 mg·kg-1 Zn,and the experimental group was fed with the basal diet supplemented with 15 mg·kg-1 Cu and 50 mg·kg-1 Zn.Pigs in the two groups was raised and managed under the same conditions except the diets for 30 days.The results showed that dietary Cu-Zn reduction exerted no influence on the growth performance of Dumei growing pigs(P>0.05).As compared to the control group,the fecal Cu and Zn contents in the experimental group were reduced by 52.8%and 40.7%(P<0.01).The present study suggested that reducing Cu addition from 60 mg·kg-1 to 15 mg·kg-1 and Zn addition from 100 mg·kg-1 to 50 mg·kg-1 in the diets was feasible,which exerted no adverse effect on the growth performance of growing pigs and could reduce the excretion of Cu and Zn.
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