title: Pulsatile secretion of luteinizing hormone and progesterone in mares during the estrous cycle and early pregnancy.
abstract: Existence of ultradian variation in serum progesterone concentration and the relation between progesterone and luteinizing hormone (LH) secretory patterns were investigated in nonpregnant and pregnant mares. Blood samples were taken every 15 minutes for a 24-hour period on day 8 of the estrous cycle and day 18 of pregnancy, respectively. Progesterone and LH concentrations were determined by radioimmunoassay. Progesterone was secreted in pulsatile manner in nonpregnant and pregnant mares. Luteinizing hormone also was secreted in a pulsatile manner in both groups of mares. There was little temporal relation between LH and progesterone pulses in either pregnant or nonpregnant mares.
authors.affiliation: Department of Veterinary Clinical Sciences, Ohio State University, Columbus 43210.
authors.forename: N R
authors.initials: NR
authors.lastname: Perkins
authors.forename: W R
authors.initials: WR
authors.lastname: Threlfall
authors.forename: J S
authors.initials: JS
authors.lastname: Ottobre
mesh_terms: D000204:Activity Cycles / Q000502:physiology; D000818:Animals; D004971:Estrus / Q000097:blood / Q000502:physiology*; D005260:Female; D006736:Horses / Q000097:blood / Q000502:physiology*; D008183:Luteal Phase / Q000097:blood / Q000502:physiology; D007986:Luteinizing Hormone / Q000097:blood / Q000378:metabolism*; D011247:Pregnancy; D011255:Pregnancy Maintenance / Q000502:physiology; D011270:Pregnancy, Animal / Q000097:blood / Q000502:physiology*; D011374:Progesterone / Q000097:blood / Q000378:metabolism*
chemical_list: D011374:Progesterone; D007986:Luteinizing Hormone