title: Studies of hormone patterns during the oestrous cycle of beef cows.
abstract: Hormone patterns in blood plasma were examined in relation to the bovine oestrous cycle in two experiments. During the luteal phase LH pulse frequency was low (2-3 pulses per 8 h). There were no consistent correlations between LH, FSH and progesterone concentrations. During luteolysis, falling progesterone concentrations were accompanied by an increase in oestradiol-17 beta concentrations, LH concentrations and LH pulse frequency, the latter being almost one pulse per hour on the day before the preovulatory surge.
mesh_terms: D000818:Animals; D002417:Cattle; D004958:Estradiol / Q000097:blood*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood*; D005498:Follicular Phase; D008183:Luteal Phase; D007986:Luteinizing Hormone / Q000097:blood*; D011374:Progesterone / Q000097:blood*
chemical_list: D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone