title: Examinations of the cycle of the pig and cow by means of a common progesterone-series method of analysis.
mesh_terms: D000818:Animals; D002417:Cattle; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D004971:Estrus; D005260:Female; D008598:Menstruation; D008722:Methods; D006080:Ovarian Follicle / Q000378:metabolism; D011247:Pregnancy; D011276:Pregnanediol / Q000652:urine; D011374:Progesterone / Q000097:blood* / Q000378:metabolism; D013045:Species Specificity; D013552:Swine; D013997:Time Factors; D014316:Tritium
chemical_list: D014316:Tritium; D011374:Progesterone; D011276:Pregnanediol