In the present study, elevated temperatures promoted
PGE2 production, but did not affect PGF2a production in
the cultured ampullary oviductal epithelial cells (Fig. 3).
The body temperature of cows is w38.5 8C, but itincreases under hot conditions. For example, the vaginal
temperature of cows was found to increase to w40.5 8C
under high-temperature conditionsOviductal smooth muscle is relaxed by PGE2 and
induced to contract by PGF2a (Al-Alem et al. 2007Since gametes and embryos are
transported by waves of contraction and relaxation,
upsetting the balance between PGE2 and PGF2a
secretions by HS may negatively affect the transport