The 1,042 Holstein cows raised in the Kyung-buk area were investigated for studying the incidence of anestrus and abnormalities associated with organic anestrus in dairy cattle. The research of extensive survey was carried out for two years from 1971 to 1972. The results obtained in this study can be summarized as follows: 1. In a study of 1,042 Cattle, 954 cases (40.9%) of preservice and postservice anestrus were recorded in 2328 reproductive cycles. 2. There were 107 cases of organic anestrus, representing 4.5% of total reproductive cycles and 11.1% of all recorded anestrus cases. 3. There were 847 cases of functional anestrus, accounting for 36.3% of total reproductive cycles and 88.7% of all recorded cases of anestrus. 4. There were 9.7% preservice and 26.6% postservice anestrus cases recorded in the category of functional anestrus. 5. Individual organic abnormalities causing or leading to anestrus were; (a) Luteal cysts (41.4%) ; Pyometra (28.9%) ; Follicular cysts (16.8%) ; Persistent corpus luteum (8.4%) ; White heifer disease (2.8%) ; Granulosa cell tumor (1.8%). 6. Pregnancy examination revealed that 21.3% were not pregnant. 7. In 1,042 cattle, total economic losses due to anestrus for a two year period were estimated at ￦3,690,000.