The goal of this study was to examine influence of Cu, Co, Zn, and Se supplementation on hematological parameters, and to set up provisional reference range for cellular blood constituents in supplemented and non-supplemented camels. Animals were fed on grass and wheat bran with known concentrations of trace elements. Zn, Cu and Co supplementation had positive effect on RBC and Hgb (0.32 and 0.38 for Zn; 0.37 and 0.3 for Cu; and 0.74 and 0.69 for Co). Se moderately negatively correlated both

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... h RBC and Hgb (-0.37 and -0.5, respectively). 25 2.3Exclusion criteria Clinically and laboratory confirmed infection, or positive findings for blood or fecal parasites. Group I consisted of 30 camels fed on mix of Saboos wheat bran racing camel feed 2 kg/day, and dry Rhodes grass 6-8 kg/day. Group II consisted of 28 non-supplemented female camels, fed on dry Rhodes grass ad libitum, in an approximate quantity of 8-10 kg/day. Both groups had free access to water. Zn, Se, Cu and Co is essential for normal growth and development of camels. Supplementation with these trace elements increased their plasma levels, and had a significant influence on RBC count, Hgb levels, PCV and Neutrophils. Since numerous clinical parameters strongly depend on hormonal status, geographical location, physical activity, or show diurnal and seasonal variations, further studies are needed on samples collected under controlled conditions. Once reference range is created based on listed criteria, it can be used as a guideline in veterinary clinical pathology.