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Pakistan Journal of Biological Sciences
Year: 2003  |  Volume: 6  |  Issue: 11  |  Page No.: 979 - 983

The Effect of Dietary Levels of Zinc-Methionine on the Performance of Growing Awassi Lambs

Mutassim M. Abdelrahman, Numan A.M. AL-Rayyan, Faisal T. Awawdeh and Awfa Y. Alazzeh    

Abstract: Twenty lambs were used in this experiment to determine the effect of zinc methionine on productive performance of growing Awassi lambs. The lambs were divided to five groups, the dietary treatments were the control diet (C), the control diet plus zinc oxide (ZnO), the control diet plus (0.1 g h-1 d-1 (Z1)), (0.2 g h-1 d-1 (Z2)), (0.3 g h-1 d-1 (Z3)) zinc methionine. Although there is no significant differences between the groups in the daily gain and feed conversion but the growth rate of Z1 and Z3 were higher than C and values of feed conversion of ZnO, Z2 and Z3 were higher than C. The growth rate in the last three weeks for the lambs of Z3 group is higher than the other groups but the differences were not significant. There are no significant differences (P< 0.05) between C, ZnO and Z3 groups in dressing percentage and carcass measurements; but the back weight in ZnO group was higher (P< 0.05) than it in the C group. The concentration of Zn in (spleen, liver, heart, lung and kidney) in the groups of C, ZnO, Z3 was not affected by treatment but its concentration in meat was significantly (P< 0.05) lower in ZnO group than C group. The differences between ZnO, Z3 and C groups in the concentration of Cu in (meat, spleen, heart, lung, kidney) were not significant but the concentration of Cu in the liver of Z3 group lambs was significantly lower (P< 0.05) than C and ZnO groups. The concentration of Zn and Cu in the blood of all group lambs did not significantly differ. The results suggest that the dietary Zinc methionine supplementation may enhance the growth rate of growing Awassi lambs especially in the last period of finishing. Moreover it appears that Zn from ZnO or Zinc methionine is absorbed to a similar extent, but may be metabolized differently after absorption.

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