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The aim of this study was to investigate the accumulation of the toxic doses of zinc in several tissues taken with diet and their effects on performance of broiler chicks. For this purpose, 60 one day
old chicks were used and they were evenly divided into two groups consisting controls and experimental broilers. Chicks in group were fed with normal ration, while the experimental group were fed with diets containing 2500 ppm zinc.
At the end of the fourth week, the chicks were slaughtered. The average live weight of the control chicks were 282.2 % higher than the experimental group and the difference was statistically significant (pXO.OOl), in addition, feed conversion rate of the control group was 243.5 % higher than the experimental group.
When the mineral substance levels in serum, liver, kidney, muscle and bone of the control group and the experimental group analysed, it was found that the different was statistically significant (p<0.001). The zinc concentrations in the tissue of experimental group were 327.9 %, 1004.4 %, 390.2 % 68.0 % and 615.6 % respectively and higher than the control group.
The results of this study indicates that the intake of toxic doses of zinc might decrease broiler performance and causes accumulation in tissues with higher content ration in the liver and kidney.