| Abstract: | A short-term test in vivo was performed with dust collected in hatcheries on a contaminated farm. The results proved the presence of infective agents of Marek's disease (MN) in the dust. The chickens hatched in these hatcheries and taken to disease (MN) in the dust. The chickens hatched in these hatcheries and taken to a disease-free environment also showed microscopic MN-specific changes. In the set of 50 chickens of the Leghorn White (LW) breed, line 44, infected aerogenically with the dust from hatcheries, MN-specific changes were found in 26 birds, i. e. in 52.0%. The non-infected control birds were MN-negative. In the set of 182 White Cornish X White Plymouth (WC X WP) hybrid chickens, hatched in contaminated hatcheries, MN-specific changes were observed in 41 birds, i. e. in 22.5% of the chickens tested. |
