The 1400 Korean cows raised in the Kyung-buk area were investigated for the purpose of considering the current status of breeding and the incidence of .reproductive disorders. An extensive research survey was carried out for two years from flay 1970 to April 1972. The results obtained in this study can be summarized as follows: 1. The incidence of breeding difficulties were found in 112 examinations (8.0%). 2. The five most common abnormalities as for their sterility were as follows; (a) anestrus (39.1%) ; (b) persistence corpus luteum (23.0%) ; (c) silent heat (17.6%); (d) endometritis (17.6%); (e) cystic ovaries (2.7%). 3. Endometritis was found in abundance by 45.0% upon 4 years of age, and cystic ovaries in 66.7% at 5 years of age. 4. The status of breeding, among Korean cows examined un this survey were; 59.0% of pregnancy, 19.0% of uncertain pregnancy, physiological vacancy 14.0% and the incidence of reproductive disorders 8.0%. 5. The conception rate on the first mating was 52.1%, on the second mating 24.4% and on the third mating 12.1%. 6. Classified by the history of delivery; 96.5% of 1400 heads had the history of 1-4 delivery.