The aim of this study to investigate the effect of different source of chromium supplementation on growth performance, blood metabolites and immune status of Murrah buffalo calves. For this twenty one murrah buffalo calves selected from the LRC at Sardar Vallabhbhai Patel University of Agriculture & Technology Modipuram, Meerut, and divided into three groups, seven in each. The group first was acted as a control. Group second was supplemented with chromium chloride (CrCl3) @ 1.0mg/kg DMI and group third was supplemented with chromium picolinate Cr(C6H4NO2)3 @ 1.0 mg/kg DMI. Blood samples where fortnightly collected for 90 days. Body weight, Body weight gain, Feed consumption, Feed conversion ratio, glucose, H.D.L. cholesterol, total cholesterol, urea, Total immunoglobulin, lymphocyte total leukocyte count (WBC), aspartate aminotransferase (A.S.T.), alanine aminotransferase (A.L.T.) and alkaline phosphatase (ALP) were estimated. Overall average value of body weight was found 95.66±1.79, 97.54±1.76 and 98.13±1.67 kg in control, T1 and T2, respectively. did not differ significantly among groups. Overall average value of body weight gain was found 4.60±0.20, 5.07±0.22 and 5.27±0.20 kg in control, T1 and T2 groups, respectively. Overall average value of body weight gain found significantly higher (P<0.05) in T1 and T2 as compared to control. Feed consumption did not differ significantly between the groups. Overall average value of feed consumption was 39.95±0.70, 38.01±0.70 and 38.20±0.67 kg in respective control, T1 and T2 groups. Overall average value of feed conversion ratio was 8.11±0.38, 7.56±0.37 and 7.30±0.32 in control, T1 and T2 groups, respectively. Overall average value of feed conversion ratio was significantly lower (P<0.05) in treatment group T2 as compared to T1 and control. The blood concentration of urea was observed significant (P<0.01) difference among groups. Average value of urea was significantly (P<0.05) lower in T2 as compared to all other groups. Overall average value of Glucose was observed significant (P<0.01) different among groups. The average value of total cholesterol was significantly (P<0.05) lower in T2 as compared to all other groups. HDL cholesterol level was differed significantly (P<0.01) among groups. The overall average value of lymphocyte concentration was significantly (P<0.05) higher in treatments as compare to control but no significant difference was found between T1 and T2. The value of WBC did not differ significantly (P<0.01) among groups. Total immunoglobin level was observed significant (P<0.01) difference among groups. Overall value of AST was significantly (P<0.05) lower in chromium picolinate supplemented group as compared to chromium chloride supplemented and control group.. The value of ALT was differ significantly (P<0.01) among groups. The value of ALP was differed significantly (P<0.05) either chromium chloride or chromium picolinate supplemented groups.

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