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Performance of Dairy Cows Fed Acid-treated High Moisture Shelled Corn

Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada

ABSTRACT

Feeding value of high moisture shelled corn (24% moisture) treated with either .95% propionic acid or a 40:60 mixture of acetic-propionic acid (1.15%) was compared with dried shelled corn in concentrate rations for dairy cows. Forty-two Holstein cows, including nine first-calf heifers were allotted randomly into three groups and fed these rations through wk 7 to 12 of lactation. Weeks 1 to 6 and 13 to 18 of lactation were standardization periods. Results of the last 2 wk of each period were analyzed. Actual and solids-corrected milk yields; milk fat, protein, and lactose percentages; and total voluntary forage dry matter intake were not significantly different among the three corn-based concentrates. Rations had no apparent effect on body weight change or animal health. Corn chemically preserved by either method of acid treatment was satisfactory and equal in feeding value to dried shelled corn for lactating dairy cows.