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This study was conducted to determine the effects of zinc supplementation either  from inorganic or organic sources on digestibility, blood metabolites and animal performance. Twelve buffalo calves of 11-13 months of age weighing 257.66 ± 26.41 kg were divided into three similar groups of 4 calves each,   where G1 was served as control ration, and was fed the basal diet consisting of roughage and concentrate mixture. While the two tested groups were fed the same basal diet, but  supplemented with 30 mg Zn//head/day of Zn sulphate (G2).  And   supplemented with 30 mg Zn//head/day as  Zink  methionine (G3). The basal diet contains 28.3 mg/kg Zn, and,  additionally, the doses of Zn in the tested  groups were orally supplemented. All animals of these groups were fed 80% of their requirements as concentrate mixture and the rest of requirements were covered from wheat straw and alfalfa hay in equal quantities. The daily requirements  of energy  and crude protein for growing calves were cover  according (NRC, 2001). Results indicated that supplemented Zn methionine or Zn sulphate  to calves diet increased significantly (pu003c 0.05) all nutrient  digestibilities  and  feeding value in terms of TDN and DCP as compared with control group.  Also, Supplemented Zn methionine for calvesu0027 diet increased significantly (pu003c 0.05) the consenterion of  serum Zn, plasma T3 and decreased significantly (pu003c 0.05) cholesterol concentration as compared with  Zn sulphate and control groups. While, serum  total  protein,  Albumin,  globulin, and AST were not affected  significantly  by zinc supplementation from inorganic or  organic sources in buffalos calves in comparison with control ration. The body weight and daily gain were significantly higher (Pu003c0.05) for claves fed supplemented Zn-methionine  or zinc sulphate ration,  than those fed control one. The body weight gain in Zn-methionine group was increased  by about 35.29% and 16.59 % than those fed control or zinc sulphate ration, respectively. There was no significant difference in total feed intake among different groups. Supplementation of Zn-meth significantly (Pu003c0.05) improved the feed conversion efficiency and the feed cost/kg weight gain as compared with Zn sulphate and control groups. From the results of this study it could be concluded that supplemented zinc from inorganic or organic sources in buffalou0027s calves diets improved digestibility and performances of growing buffalo and  calves could be recommended that supplement Zn-methionine to  growing buffaloes calves rations under Upper Egypt conditions because of its higher bioavailability than Zn sulphate.

egyptian journal of nutrition and feeds

EFFECT OF ZINC SUPPLEMENTION FROM INORGANIC AND ORGANIC SOURCES ON NUTRIENT DIGESTIBILITY, SOME BLOOD METABOLITES AND GROWTH PERFORMANCE OF GROWING BUFFALO CALVES