Ingredient and nutrient composition of the diet.

1Wet corn gluten feed (Sweet Bran; Cargill Inc., Blair, NE).2Premix consisted of 54.9% expeller soybean meal, 14.3% limestone, 10.2% sodium bicarbonate, 10.0% calcium salts of long-chain fatty acids (Megalac-R; Arm & Hammer Animal Nutrition, Princeton, NJ), 2.6% Diamond V XP yeast (Diamond V Mills, Inc., Cedar Rapids, IA), 2.0% magnesium oxide, 1.6% potassium carbonate, 1.6% salt, 1.6% Vitamin E premix (44 IU/g), 0.6% 4-Plex (Zinpro Corp., Eden Prairie, MN; consists of zinc 2.58%, manganese 1.48%, copper 0.90%, cobalt 0.18%, methionine 8.21%, and lysine 3.80%), 0.3% selenium premix (0.06% Se), 0.1% Vitamin A premix (30 kIU/g), 0.1% Vitamin D premix (30 kIU/g), 0.1% Rumensin 90 (Elanco Animal Health, Greenfield, IN), and 0.1% Zinpro 100 (Zinpro Corp., Eden Prairie, MN; consists of 10% zinc and 30% methionine).3Estimated according to NRC [12].