Successful pork production depends first upon selection of good breeding stock. The breeding stock selected should have the inherent ability to produce and nurse a large litter that will use feed efficiently. Equally important are proper feeding and management of the brood sow and her litter.
It is a good plan to separate the gilts from the fattening hogs at 4 to 5 months of age and feed them a growing ration.
Whole oats or a mixture of one-half oats and barley or wheat coarsely ground, self-fed, constitute a good foundation for a ration. Enough corn should be fed, probably a couple of ears daily, to each gilt to keep her gaining.
One-half gallon of skimmilk daily or 1/2 pound of protein concentrate will furnish sufficient protein for one gilt in addition to what she obtains from grain and pasture. (The protein concentrate may be hand-fed or mixed with the grain on the basis of 5 pounds to each 100 pounds of grain.)
Quaife, E. L.; Anderson, A. L.; Culbertson, C. C.; and Catron, Damon
"Pig production feeding and management of the brood sow and litter,"
Bulletin P: Vol. 5
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletinp/vol5/iss113/1