During the period from 1965 to 1974, some schools prohibited Inoko events and the Inoko event was abolished because students were too preoccupied with preparation for the event or practice of Inoko songs to concentrate on their homework or to study.
尚、昭和40年代に、この時期になると準備や亥の子歌の練習に夢中になり、宿題や勉強がおろそかになることなどから、学校が亥の子行事を禁止し廃れてしまった地域もある。