Comparison of luteolysis and timed artificial insemination pregnancy rates after administration of PGF in the muscle or the ischiorectal fossa in cattle.

Prostaglandin F (PGF) is commonly injected intramuscularly (IM) in female cattle in synchronization protocols. A novel site for administration of PGF that improves beef quality assurance is the ischiorectal fossa (IRF). The objective of this study was to determine whether administration of PGF in the IRF results in a similar physiological response to an intramuscular injection.