Abstract
Peripartum period in cows is considered as the most stressful period and maximum suppression in the phagocytic activity (PA) of neutrophils occurs at calving. To study the effect of micronutrients on the in vitro PA of blood neutrophils, blood samples were taken from freshly calved Karan Fries cows and their neutrophils were isolated. Four micronutrients (α-tocopherol, Vitamin A, Copper and Zinc) were supplemented in vitro to the culture of neutrophils and yeast cells/ zymosan at the levels of 0 (control), 5, 10, 25, 50, 75, 100 and 150 percent. PA of blood neutrophils was estimated both by microscopic and nitro blue tetrazolium (NBT) assay. Supplementation of α-tocopherol at a concentration of 3.483 μM (75%), Vitamin A (VA) at a concentration of 1.397 μM (50%), copper (Cu) at a concentration of 2.361 μM (25%) and zinc (Zn) at the concentration of 9.176 μM (75%) showed maximum PA. Excess supplementation of Cu at 14.164 μM (150%) significantly (P<0.01) decreased the PA. Our results suggest that micronutrients when added in limited concentration to the culture medium of neutrophils improved their PA.
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