Enucleation of the Corpus Luteum.
Enucleation of the corpus luteum by digital expression per rectum was practiced prior to the availability of prostaglandin F2alpha. It was followed by estrus in 3 days. Hemorrhage and the formation of adhesions were undesirable side effects. Occasionally a cow suffered a fatal hemorrhage. The enucleated CL is shown in this image on the left side of the large blood clot in the broad ligament at the level of the cervix. There is also a small blood clot in the ovarian bursa. In the meantime a new CL has formed in the right ovary where it can be identified by its ovulation papilla.
Roberts SJ (1973)