Skomorucha , I. and Sosnówka-Czajka, E. 2018. The effect of mixed herb extract on selected stress parameters in broiler chickens of three genetic lines. Annales Universitatis Paedagogicae Cracoviensis Studia Naturae. 3, 2 (Dec. 2018), 60–66. DOI:https://doi.org/10.24917/25438832.3supp.8.