Pigs need a warm, clean area under a roof to sleep, and they should not be crowded. They need to be checked for sickness regularly. Pigs need lots of water. Over half their body weight is made up of water. Pigs should be given all the feed they will eat, which is usually four to five pounds a day for adult pigs. Corn is a good food for pigs, but they should also have protein supplements as well.