Abstract
PICO QUESTION: In broodmares undergoing artificial insemination, is intrauterine fluid development more likely postinsemination with frozen semen compared to insemination with chilled semen? CATEGORY OF RESEARCH: Incidence. NUMBER AND TYPE OF STUDY DESIGNS REVIEWED: Three retrospective cohort studies were critically appraised. STRENGTH OF EVIDENCE: Weak. OUTCOMES REPORTED: A lower rate of postbreeding intrauterine fluid occurred in mares inseminated with frozen semen compared to chilled semen in two studies, and a higher rate in one study. CONCLUSION: The evidence available is weak and warrants further research into postbreeding intrauterine fluid rates in mares inseminated with frozen and chilled semen.