In the Ryukyu Kingdom and so on, buta banjo existed, which had the same method of a lavatory as found in China, where shima buta (pigs in the Ryukyu Kingdom) were kept under the lavatory and fed directly by human excrement.
また、琉球王国などにおいては中国と同じ方式の便所の穴の下でシマブタを飼い、餌として直接供給する豚便所も存在した。