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Thirty thousand commercial broiler chicks in 30 different flocks were vaccinated with live attenuated lentogenic strain ND vaccine (local isolate) through drinking water at the age of day 5 and boostered on day 26 in field condition. Serum samples were collected randomly from 10% of the vaccinated chicks before primary vaccination, before boostering and before marketing. HI antibody titre was determined from each sample as per the method OIE, 2009. Twelve birds just before marketing (at the age of 40th day) of each 30 flocks were subdivided into two groups i.e. experimental group and vaccinated control group. | Studies on the seroconversion of attenuated lentogenic ND vaccine (Local Isolate) through drinking water in broiler chicks
