The effect of the Czechoslovak product
Nitrovin, administered at a rate of 15 mg per kg of feed mixture, was studied as exerted on the growth activity, meat quality, and the development and intensity of occurrence of patho-morphological changes ascribable to
Marek's disease. An increase of
weight gains and dressing percentage was recorded in the group of birds given
Nitrovin, as well as in those which had
Nitrovin in their feed and were infected with a highly virulent virus of
Marek's disease. No significant changes occurred in the contents of dry matter and
protein, but there was a much lower fat content in breast muscle in the groups of chickens infected with the
Marek disease virus. Internal organs were subjected to biometrical measurements. The birds treated with
Nitrovin and infected with the highly virulent virus of
Marek's disease had significantly lighter hearts and heavier spleens. Liver, nervus ischiadicus, gonads and spleen were affected most intensively by the changes testifying to
Marek's disease. The results are just preliminary and the investigation continues.