What principles should be followed when grouping commercial pigs

First, pigs that are similar in origin, body weight, body condition, temperament and feed intake should be kept and raised as one group. Within the same group, the difference in body weight should not be too large: for piglets, no more than 3 to 5 kg, and for growing-finishing pigs, no more than 5 to 10 kg is best. After grouping, the groups should remain relatively stable and generally should not be changed arbitrarily. Second, suitable density. Generally, each weaned piglet occupies 0.7 sq m of pen space, and each finishing pig occupies 1.2 sq m. Each group should preferably consist of 10 to 15 pigs. In winter, the stocking density can be appropriately increased, and in summer, it should be appropriately reduced.