“…Further correlation is provided by the fact that chicks fed a diet deficient in the unidentified growth factor grew better if their dams were fed a diet containing the hatchability factor (Bethke, Pensack, and Kennard, 1947). SUMMARY Two experiments with hens showed that a diet of yellow corn, oats, wheat byproducts, dehydrated alfalfa meal, soybean oil meal (expeller), minerals, and adequate vitamin A, D, and riboflavin is deficient in a factor essential for good hatchability.…”