Thiamine and vitamin B 6 are supplied in more than adequate amounts by the feed in normal swine rations. Recent research shows an increase in pigs per litter from adding folic acid to sow rations. Riboflavin functions in the animal's enzyme system. It is heat-stable but is destroyed by alkali and light. It is available in good amounts in legume hays, dairy byproducts and in fair amounts in tankage and soybean oil meal.
Cereal grains are a rather poor source of riboflavin.
Niacin functions as a co-enzyme. It is resistant to heat and is quite stable in feeds. Fish meals, corn distillers solubles and wheat bran are good sources of niacin. It may be in a bound or unavailable form in cereal grains, especially corn. Pantothenic acid is stable in heat and light.