Abstract
Anti-Mullerian hormone (AMH) and progesterone concentrations were evaluated in two mares with hemorrhagic anovulatory follicle at detection (day 0), immediately prior to PGF2α administration (day 7) and after commencement of oestrus (day 12). AMH decreased (from 0.77 and 1.32 ng/ml to 0.27 and 0.95 ng/ml, respectively) and progesterone increased (from 7.66 and 7.30 ng/ml to 9.15 and 7.49 ng/ml, respectively) over time with the development of anovulatory follicle. Following PGF2α administration 7 days after detection, the anovulatory follicle disappeared, AMH increased (from 0.27 and 0.95 ng/ml to 0.99 and 1.58 ng/ml, respectively) and progesterone decreased (from 9.15 and 7.49 ng/ml to 0.60 and 0.57 ng/ml, respectively). Despite changes in AMH concentrations with development and disappearance of anovulatory follicle, AMH values did not differ between anovular mares and normal cyclic mares (n = 26; 1.3 ± 0.23 ng/ml; range 0.47–5.66 ng/ml), implying that AMH could not serve as a diagnostic marker for anovulatory follicles in equine.
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