Effect of adjunctive treatment with intravenously administered Propionibacterium acnes on reproductive performance in mares with persistent endometritis.

Objective: To determine whether treatment with a preparation of Propionibacterium acnes would improve pregnancy and live foal rates in mares with persistent endometritis.

Design: Randomized placebo-controlled clinical trial.

Animals: 95 mares with a cytologic diagnosis of persistent endometritis.