Pigs in their natural state eat little and often. This however, is not practical and they should be fed twice daily, morning and afternoon.
Pregnant and lactating sows should be fed at a higher rate as their nutritional needs are greater. Adult boars and sows should have 2-3lb per day. This amount differs for lactating sows and piglets. Compound feeds are the most convenient to use. They are formulated as complete rations and contain all necessary mineral, vitamins etc. Do not over feed your pig, pigs will always appear hungry.
Also pigs should have fresh water available at all times.