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Effects of supplementary methionine-copper and protein-copper complexes on the growth, mineral metabolism and intestinal microflora of broiler chickens and rats


Effects of supplementary methionine-copper and protein-copper complexes on the growth, mineral metabolism and intestinal microflora of broiler chickens and rats



Korean Journal of Animal Nutrition and Feedstuffs 18(2): 103-113



Two experiments were conducted OD study the influence of sources of supplementary copper(Cu) on the performance of broiler chickens and rats. In experiment 1, two hundred forty hatched male broiler chickens(Tatum strain) were randomly divided into 24 groups of 10 birds each and fed one of the following diets in raised floor batteries for 6 wks; control, or diets containing 200 ppm of supplementary a from CuSO-4 cntdot 5H-2O(CuSO-4), from methionine-Cu complex(MET-Cu), or from fish meal-Cu complex(FM-Cu). Results showed that weight gain and feed intake were not significantly affected by the dietary treatments. However, MET-Cu treatment tended to improve weight gain by 2.1 %, compared to the control. Feed efficiencies of MET-Cu and CuSO-4 treatment were significantly(p lt 0.05) better than that of the control. Concentration of Cu in the liver tended to be higher in Cu-supplemental treatments than in the control. Concentration of Zn in the liver was not influenced by the treatments, but that of Fe tended to be lower in the Cu supplemented treatments than in the control. Concentration of Cu in feces were significantly (p lt 0.01) higher in Cu-supplemented treatments than in the control. Severe gizzard erosions were observed in the birds fed Cu-supplemented diets. The pH of gizzard content were significantly (p lt 0.05) lower in Cu-supplemented treatments than in the control. The populations of coliforms and Clostridium perfringens in the cecum tended to be lower in Cu-supplemented treatments than in die control. The ceruloplasmin activity of the serum tended to be higher in Co supplemented treatments than in the control. In experiment 2, 32 weanling male rats of Sprague Dawley strain were allotted to the same treatments as in experiment 1 and fed for 6 wk. Weight gain and feed intake tended to be lower and feed/gain tended to be higher in Cu-supplemented groups than in the control. Concentration of Cu in the liver tended to be higher in Cu-supplemented groups than in the control. Concentration of Zn in the liver was not affected by the treatments while that of Fe tended to be lower in Cu-supplemented groups than in the control. Concentration of Cu, Zn and Fe in feces was significantly(p lt 0.01 for Co and p lt 0.05 for Zn and Fe) higher in Cu-supplemented groups than in the control. The populations of coliforms and Clostridium perfringens in the cecum tended to be lower in Cu-supplemented groups than in the control. Ceruloplasmin activity of the serum was significantly(p lt 0.05) higher in Cu-supplemented groups than in the control. In conclusion, 200 ppm of supplementary copper in the form of methionine-copper complex effectively improves feed/gain in broiler. But growth rate and feed efficiency of rats were depressed when the same level of copper, regardless of sources or forms of complex, was supplemented.

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