a Cholecalciferol was added to base diets in order to obtain 5 levels of dietary cholecalciferol (2200, 9700, 17200, 24700, and 102200 IU/kg feed). The basal diet (control) contained 2200 IU/kg feed.
b Dried distillers’ grains with solubles.
c This week is hen’s age, not treatment week.