The first day of Doyo in midsummer and midwinter are often simply called ushi no hi (day of the ox). People often eat eel on the day of the ox in summer because it is high in nutritional value and can restore people'‚“ vitality. On the winter day of the ox, people use chapstick in order to prevent their lips from chapping. This is another old custom.
*Doyo are the days which mark the 18 days before the beginning of each season in the lunar calendar.