During the Qin and Han dynasties, manure, silkworm eggs, silkworm pupa juice, bone juice, bean dustpan and river mud were also used as fertilizers, among which manure was particularly developed at this time. After liberation, a large number of toilet seats were unearthed in China. For example, the pigsty with toilet in Han Dynasty unearthed in Huixian County, Henan Province. This toilet ring connecting the pigsty and the toilet reflects the importance and universality of pig manure accumulation at that time. At the same time, it is also a reflection of the long history of pig manure in China.

Han dynasty toilet pigsty