The effect of propolis extract in the diet of chickens Ross 308 on their performance

The focus of the study was the performance of Ross 308 chickens after the application of extract in their diet. The nutritional value of feed mixtures for chickens was equal, but the experimental groups were also added extract in the dose of 200 mg.kg-1 (E1), 300 mg.kg-1 (E2) and 400 mg.kg-1 (E3), respectively