In broodmares undergoing artificial insemination is intrauterine fluid development more likely with frozen semen or chilled semen?

Question In broodmares undergoing artificial insemination, is intrauterine fluid development more likely postinsemination with frozen semen compared to insemination with chilled semen? Clinical bottom line 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.