The left ovary shows a stellate scar in evidence of the manual enucleation (expression) of a corpus luteum. The right ovary shows a normal corpus hemorrhagicum. The practice of enucleation was relatively common prior to the advent of prostaglandin F2alpha, to initiate a new cycle. Hemorrhage and the formation of adhesions were undesirable side effects. Occasionally a cow suffered a fatal hemorrhage.
Roberts SJ (1973)