effect of hygienic conditions on vaccination response in Poultry

A random samples of twenty. six water samples (13 tap water samples and 13 ground water samples) were collected from some poultry farms in Kalyobia Govemorate and subjected to chemical examination to eval uate their hygienic quality. The effect of environwas studied. The temperature and period of incubation and age of birds from which RBCs were collected where studied as factors affecting the results of HI test for determination of humoral immune response against NDvirus vaccine. I. Chemical analysis of w