Forage crops are essential in good and economical summer rations for growing and fattening swine. They provide a way to cut down the cost of gains, inasmuch as they cut down on the requirement of meat meal tankage and other desirable protein supplements which are usually high in price. At the same time they enlarge opportunities for the quicker, more profitable raising of better and healthier pigs.
Evvard, John M., "Forage Crops Save Protein Supplements" (1923). Circular. Paper 83.