Severe constriction of the vagina at the level of vulvo-vaginal junction leaving an aperture of less than 1 cm. Vulva is in the upper right hand corner. The stained vagina is due to foul discharge from the uterus. The cow had delivered a calf before (per vaginam) and may have been traumatized at that time. The incised tissues of the roof of the vestibulum are white. The cow had been artificially inseminated.
Gunn A (2010)