Abstract
A 20% crude protein corn-soybean meal ration fortified with minerals, vitamins A and D and 6 vitamins of the B complex (including a B12 concentrate) was not improved by the addition of either choline or betaine. Since, in a previous test, choline significantly improved a similar ration without the vitamin B12 concentrate it is suggested that B12 has a sparing effect on the choline requirement of the pig. The two solvent soybean meals used were superior to expeller soybean meal, using rate of gain as the criterion, when fed in rations equated to contain 20% crude protein. Copyright © . .