title: Oocyte maturation inhibitor, inhibin and steroid concentrations in porcine follicular fluid at various stages of the oestrous cycle.
abstract: Oocyte maturation inhibitor (OMI), inhibin, progesterone and oestradiol 17 beta concentrations were measured in fluid collected from small (less than 3 mm), medium size (3-6 mm) and large (greater than 6 mm) porcine ovarian follicles, which were obtained on Days 5, 10, 15 and 18 of the oestrous cycle and at 24 h after the onset of oestrus. Concentrations of OMI decreased with increasing follicle diameter (P less than 0.05), independent of the stage of the oestrous cycle. Concentrations of inhibin showed a tendency to decrease with increasing follicle diameter on Days 10, 15 and 18, but not on Day 5 of the cycle. Concentrations of OMI and inhibin in the largest follicles were low before the onset of oestrus, and were essentially unaltered 24 h later. A positive correlation was found between OMI and inhibin concentrations, whereas the correlation between inhibin concentration and log (progesterone concentrations) was negative.
mesh_terms: D000818:Animals; D001826:Body Fluids / Q000032:analysis; D004958:Estradiol / Q000032:analysis*; D004971:Estrus; D005260:Female; D007265:Inhibins / Q000032:analysis*; D036341:Intercellular Signaling Peptides and Proteins; D006080:Ovarian Follicle / Q000032:analysis*; D010455:Peptides / Q000032:analysis*; D011247:Pregnancy; D011374:Progesterone / Q000032:analysis*; D013552:Swine
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D010455:Peptides; C018355:intraovarian peptides; D011374:Progesterone; D004958:Estradiol; D007265:Inhibins