Summary
The effect of oral administration of iron on haematological, biochemical and immunological parameters in neonatal calves was studied. Ten calves from a private farm in Gharbia Governorate were used. Calves were separated from their dams immediately after birth and received colostrum during the first hours after calving and twice daily for 48 h. Thereafter, they received whole milk. Calves were divided into two equal groups. The first group was kept as controls. Calves of the second group were given ferrous sulphate at a dose of 250 mg/calf daily, beginning at one day of age; this was continued for 28 days. Three blood samples were collected from each calf in all groups at 14, 21, 28 and 35 days of age. Iron administration produced a significant increase in red blood cell count, haemoglobin, packed cell volume and blood indices, in addition to non-significant changes in total and differential leukocyte counts. The administration of iron resulted in a significant increase in serum iron, total proteins, globulins, thyroid hormones, lymphocyte stimulation index, phagocytosis, body weight and body gain. The administration of iron is suggested as routine practice in calf-producing farms due to its advantageous effects on the parameters tested.

Keywords
Biochemistry, Calf, Egypt, Haematology, Immunity, Iron, Nutrition.