抄録
Rectal examination was performed on a total of 72 sows since 1968. The ovary was touched in 68 sows. Polycystic ovary was found in 51 sows. PMS had no curative effect on these sows. This examination was applied effectively over a period of 30 days to 7 weeks after parturition to detect any disorder in the ovary due to disturbances in the internal secretion.
