The effects of dexamethasone and prednisolone on pituitary and ovarian function in the mare.
Authors: Ferris R A, McCue P M
Journal: Equine veterinary journal
Summary
# Editorial Summary Ferris & McCue (2010) investigated how two commonly used corticosteroids—dexamethasone and prednisolone—affect the hypothalamic-pituitary-ovarian axis in mares, given that these agents have shown promise in improving conception rates in mares with persistent post-mating endometritis. Using controlled experimental protocols, the researchers assessed pituitary hormone secretion (specifically luteinising hormone and follicle-stimulating hormone) and ovarian response to treatment in healthy cycling mares exposed to both corticosteroids. Their findings revealed that dexamethasone produced significant suppression of LH and FSH, alongside delayed follicular development, whereas prednisolone demonstrated a notably less severe impact on these reproductive parameters. For practitioners managing fertility cases, these results suggest that prednisolone may offer a safer option than dexamethasone when corticosteroid therapy is indicated for problem mares, as it provides anti-inflammatory benefits whilst posing substantially lower risk of disrupting the normal endocrine milieu required for optimal ovarian function and conception.
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Practical Takeaways
- •Corticosteroid administration shows promise for improving fertility in mares with recurrent post-mating endometritis, though the full effects on reproductive endocrine function need clarification
- •Further research is needed to understand how these drugs affect pituitary-ovarian axis function before recommending routine clinical use
- •Problem mares with endometritis may benefit from anti-inflammatory corticosteroid protocols, but treatment protocols require more rigorous study
Key Findings
- •Corticosteroids have been reported to improve pregnancy rates in problem mares with persistent mating-induced endometritis
- •The mechanism of improved pregnancy rates involves modulation of the post-mating inflammatory response
- •Effects of dexamethasone and prednisolone on pituitary and ovarian function require further investigation