Naturally, sow milk provided liquid and nutrients, but after weaning, the pig needs to distinguish between thirst and hunger and also to realize that these needs must be satisfied via separate media.

• 自然的，母猪提供了液体奶，并且营养高，但是断奶后，小猪则需要自己区分饥饿和口渴，同时要它们自己通过不同的器具满足饥渴需求。