Effect of coccidiostats on the quality of the immune response following the vaccination of chickens against Newcastle disease

: An experiment was carried out to test the effect of two coccidiostatica, amprol and monensin, on the level of the Newcastle disease anti-hemagglutinins. The study made use of broiler chickens of a four-line hybrid (Plymouth Rock x Cornish) treated with a Hitchner B vaccine. The drugs were admixed with the feed--amprol at the rate of 0.5 g/kg, and monensin at 1 g/kg throughout the entire experimental period. The level of antibodies was recorded by means of the IH level. Highest titers of anti-hemagglutinins were discovered in the group treated with monensin. The birds of this group had higher liveweight as against the remaining birds.