Effect of Vitamin-A Deficient Diet on Immune Response in Newcastle Disease Infected Broilers

Effect of vitamin A deficiency was determined on the immune response of broilers. The experimental feed was prepared having vitamin A level at the rate of 500 IU/kg of feed. Vitamin A deficiency in feed significantly lowered (P<0.05) the gain in body weight with poor feed conversion ratio (FCR). In Newcastle disease virus (NDV) infected broilers kept on vitamin A deficiency showed greenish white droppings, ruffled feathers with leg weakness, while NDV infected birds kept on vitamin A at the rate of 1500 IU/kg of feed (Standard requirement) did not show clinical signs of ND. Geometric mean titer (GMT) against NDV was lower in broilers kept on vitamin A deficiency in feed.