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Performance of Dairy Cows Fed Propionic Acid-treated High-moisture Shelled Corn Rations for Complete Lactations

Department of Animal Science, Macdonald Campus of McGill University, Ste. Anne de Bellevue, Quebec, Canada

ABSTRACT

High-moisture shelled corn (66.5% dry matter) preserved with 1.5% propionic acid, dry shelled corn, and ear corn were mixed into concentrate rations at 71.4, 65.0, and 66.8%. Each concentrate was fed to six lactating dairy cows for 305 days or a full lactation. Actual and fat-corrected milk yields, persistency of milk production, milk fat and protein percentage, and changes in body weight were not significantly different between the three corn-based concentrates. Intakes of the three grain rations were similar during early lactation (week 3). However, during mid-lactation (week 18) cows consumed more dry shelled corn than high-moisture shelled corn, while during late lactation (week 34) cows consumed more ear corn than high-moisture shelled corn. There was no apparent effect of rations on animal health. Feeding value of high-moisture shelled corn treated with propionic acid at harvest equalled that of dry shelled or ear corn.