Vaccinations against duck epidemics in relation to environmental changes

Three laying duck fanns were examined over a period of one year where the microclimatic changes (temperature, relative humidity, ammonia and carbon dioxide) were estimated after vaccination against duck cholera (1 st_injection at 8 weeks and the 2nd one ahepatitis (at 16 weeks of age by using hepatovax vaccine). the effects of microclimatic changes on immunity of ducks (antibody titres) were studied. Moreover, morbidity and mortality rates were recorded for one week after vaccination of ducks against thei