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High Moisture Corn Preserved with Esters of Propionic Acid for Lactating Cows¹

Dairy Science Department, South Dakota State University, Brookings 57007-0647

ABSTRACT

Forty lactating Holstein cows over 2 yr of age were used to compare rolled dry shelled corn with high moisture (75.6% DM) ground shelled corn preserved with esters of propionic acid (1% of corn weight) in a concrete bunker silo. Cows were fed complete mixed rations containing (dry basis) 34.9% corn silage, 20.0% alfalfa haylage, 33.6% corn grain, and 11.5% of soybean oil meal, vitamins, and mineral premix. Milk yields, its composition, feed intakes, and body weight changes were similar for cows fed dry corn and high moisture corn. Rumen proprionate was higher and isobutyrate and isovalerate were lower for cows fed high moisture corn than for dry corn diets. Rumen pH and ammonia were lower for cows fed high moisture corn than for those fed dry corn.

¹ Published with the approval of the director of the South Dakota Agricultural Experiment Station as Publication 2321 of the Journal Series.

² Myco Curb, Kemin Industries, Des Moines, IA, contains primarily esters of propionic acid, and small amounts of acetic, sorbic, benzoic acids, hydrated ammonium phosphate and butylated hydroxy anisole. The esters are primarily mono- and diesters of propandiol.