title: [Classification of leukosis-free flocks of chickens].
mesh_terms: D000818:Animals; D001353:Avian Leukosis / Q000276:immunology*; D002645:Chickens / Q000145:classification*; D011201:Poultry Diseases / Q000276:immunology*
vernacular_title: Klassifikatsiia bezleĭkoznykh stad kur.