Not for sale. By the end of June 5438 +20231October 3, Shuanghui brand did not sell local black pigs in 2022. Black pigs have a slow growth period and low weight, and the annual black pigs are only1.50kg.. Therefore, at the end of last century, after a large number of western white pigs entered China, they were almost extinct. Tuhe black pig is a rare protected population in contemporary times.