 The experiment called for four groups of four heifers each during which three groups were raised and two pregnancies were carried through during the experiment.The first group ate only corn (corn stover, corn meal and gluten feed), the second group ate only nutrients from the wheat plant (wheat straw, wheat meal and wheat gluten), the third group ate only nutrients from the oat plant (oat straw and rolled oats), and the last group ate a mixture of the other three.In 1908, it was shown that the corn-fed animals were the most healthy of the group while the wheat-fed groups were the least healthy.