The culture temperature had no effect on PGF2a
production in either the ampullary cells or isthmic
cells
but did not affect PGF2a production in
the cultured ampullary oviductal epithelial cells The body temperature of cows is w38.5 8C
Oviductal smooth muscle is relaxed by PGE2 and
induced to contract by PGF2a (Al-Alem et al. 2007,
Siemieniuch et al. 2009). Since 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.
In conclusion, HS is
suggested to not affect the secretary function of PGs in
the isthmic oviduct.
The overall findings suggest that HS upsets the balance
between PGE2 and PGF2a secretions, which would be
expected to decrease the motility of the oviductal
smooth muscle, which is important for gamete/embryo
transport. This could lead to the low fertility in cattle
in summer