Zoology environment: The central production areas of Rongchang Pig are Rongchang county of Chongqing and Longchang county of Sichuan province. It is also distributed over the nearby Yongchuan, Lu county, Luzhou and Hejiang. The main production areas are found southeast of Sichuan basin, where the altitude is 315~500 meters. It has a mild climate with average temperature of 18ºC. There is adequate rainfall and many rivers that facilitate irrigation.