A transvaginal endoscopy-based technique for performing ovarian examinations in sows.For examining pig ovaries, which have complex structures, laparoscopy is a useful technique, but requires general anesthesia; therefore, it cannot be performed repeatedly within a short period of time. 
laparoscopy
Using a colonoscope, the vaginal wall was punctured with a trocar. 
colonoscope
Then, a urethroscope was inserted into the abdomen, and an examination was carried out after the ovaries had been moved towards the urethroscope camera via rectal palpation. 
urethroscope