"Post-breeding endometritis is a major cause of subfertility, affecting approximately 15% of mares," said John Steiner, DVM, Dipl. ACT, of Hagyard Equine Medical Institute. "We know it's a big problem, so we've tried an adjunct treatment to see if this would help."

He and his colleagues recently examined the efficacy of Propionibacterium acnes, sold under the trade name

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