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| Effect of dietary supplementation with copper-glycine instead of copper sulfate on growth performance, serum biochemicalparameters and fecal copper excretion in weaned piglets |
| Received:October 22, 2014 |
| DOI： |
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| Abstract: |
| The paper determined the effects of dietary supplementation with low levels of copper-glycine instead of
copper sulfate on growth performance, serum biochemical parameters, and fecal copper excretion in weaned piglets. The
results showed that, compared with 200 mg/kg copper sulfate group, the average daily gain, average daily feed intake, gain:
feed ratio, and diarrhea rate showed no significant differences in 100 mg/kg copper-glycine group. Compared with the other
two groups, the ADG in 50 mg/kg copper-glycine group was significantly decreased and G/F ratio significantly increased
respectively. Among the three treatment groups, the serum mineral contents, such as copper and iron had no significant
difference. The serum activity of glutamic-oxalacetic transaminase in 100 mg/kg copper-glycine group was significantly
higher than that in the other two treatment groups. The fecal copper concentrations in 50 mg/kg and 100 mg/kg copperglycine
group were significantly lower than that in 200 mg/kg copper sulfate group. The fecal contents of iron and zinc
showed no significant differences among the three groups. In conclusion, these results suggested that dietary
supplementation with 100 mg/kg Cu as glycine copper could effectively replace the 200 mg/kg Cu as cupric sulfate, then
reduce the additive amount of copper in feed and decrease the pollution of fecal copper discharged to the environment. |
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