Ecological pigs should be raised in an ecological way, that is, the relationship between various livestock and poultry, aquaculture and agricultural planting should be effectively utilized to form a virtuous circle of biological food chain, turn waste into treasure, comprehensively develop, create maximum benefits at the lowest cost, and finally reduce the damage to the ecological environment. The main modes are:

(1) pig and fish are raised in an integrated way, and pig manure is fed to fish;

(2) Comprehensive feeding of chickens, pigs and fish, with chicken manure feeding pigs and pig manure feeding fish;

(3) Pig biogas vegetable mode, in which pig manure is used as biogas, biogas residue and biogas slurry are used to grow vegetables;

(4) Pig biogas fruit model Pig manure is used to make biogas, and biogas residue and biogas slurry are used to plant fruit trees.