The importance attached to ovarian dysfunctions as a cause of sterility in cattle has waxed and waned with the years. At the beginning of this century Swiss investigators (Zschokke 1900, Hess 1921) believed that ovarian disorders and their treatment represented the heart of the bovine sterility problem. With the spread of tuberculosis and brucellosis over wider areas of the world, uterine lesions attracted attention. Albrechtsen (1920) considered uterine disorders to be of prime importance for bovine sterility. Concomitant with the elimination of these infections and the reproduction losses which follow in their wake, bovine sterility arising from functional disorders has again emerged into the limelight. Of these disorders ovarian dysfunctions are of primary interest. One of these, "cystic ovaries", has been thoroughly studied, clinically and morphologically by Garm (1949), and genetically by Henricson (1957).
The clinical signs, rectal and vaginal findings, and cyclic abnormalities of functional ovarian disorders such as