title: Milk progesterone as a parameter for fertility control in cattle; methodological approaches and present status of application in Germany.
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D005260:Female; D005298:Fertility; D005860:Germany, West; D008722:Methods; D008892:Milk / Q000032:analysis*; D011247:Pregnancy; D011374:Progesterone / Q000032:analysis*
chemical_list: D011374:Progesterone