Leukocyte Profile of Friesian Hosltein Dairy Calves

Abstract

The aim of this study was to investigate the leukocyte profile of growing calves in order to evaluate the need for defining reference values at different age groups. Fifteen Friesian Holstein calves were divided into five groups of age (1, 3, 6, 9, and 12 months). Each animal was examined and considered to be clinically normal at the time of blood collection. Blood samples were taken from jugular vein using EDTA anticoagulated venoject. Differential leukocyte blood were stained by Giemsa and performed microscopically. The results showed that the profile of lymphocytes and total leukocytes showed a relatively stable value at the age of 3-9 months and the highest numbers of leukocyte and lymphocyte were at 12 months of age. The highest numbers of neutrophil were at 1 months of age and the lowest were at 6 months of age.