According to the investigation of reproductive status and disorders in Jeju native cattle, the delayed puberty, fist calving age in heifer, and the alternate year calving cow due to anestrus following calving were observed more frequently on this island. This study, therefore, was carried out to investigate the effect of PMS as a method of treatment for the cows with ovarian hypoplosia and atrophy. For the 15 cows with ovarian hypoplasia, the blood was tested and 40 cows of anestrus due to ovarian hypoplasia and atrophy were selected to treat with PMS. The results obtained were an follows. 1. The blood test indicated that cows of the ovarian hypoplasia appeared to bave lower serum protein and calcium level than that of normal cow. Especially obnormality in A/G and Ca/P ratio in Holstein was found. 2. Treatment of PMS hormone into 40 cows with the ovarian atrophy and hypoplasia showed emus on average 6.7 days after the final hormone injection. 3. Total 38 cows were conceived by PMS (1000 IU) hormone treatment; 26 cows (68.4%) at the first estrus, 11 cows (30.6%) at the second estrus and the remainder at the third estrus. 4. The above results inducated that treatment of PMS hormone into cows with ovarion hypoplasia and atrophy was effective for inducing estrus and conception.