title: Circadian and ultradian rhythms in ruminants: relevance to farming and science.
authors.affiliation: Agricultural Research Service, USDA, Livestock and Poultry Science Institute, Beltsville, Maryland 20705.
authors.forename: A M
authors.initials: AM
authors.lastname: Lefcourt
mesh_terms: D000204:Activity Cycles / Q000502:physiology*; D000822:Animal Husbandry; D000818:Animals; D000829:Animals, Domestic / Q000502:physiology; D001699:Biometry; D001831:Body Temperature / Q000502:physiology; D002417:Cattle; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006728:Hormones / Q000378:metabolism; D008413:Mastitis / Q000175:diagnosis / Q000503:physiopathology; D012418:Ruminants / Q000502:physiology*
chemical_list: D006728:Hormones