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Journal of Dairy Science Vol. 70 No. 7 1417-1425
© 1987 by American Dairy Science Association ®
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Aerobic Storage and Utilization of Ammonia-Treated Distillers, Wet Grains for Lactating Dairy Cows1

C.O.L.E. Johnson2 and J. T. Huber3

Department of Animal Science, Michigan State University, East Lansing 48824

ABSTRACT

Two experiments were conducted to determine the influence of NH3 treatment on the aerobic stability of distillers wet grains and value of the NH3-treated grains as protein supplements for lactating cows. In Experiment 1, fresh distillers wet grains were treated with NH3 at 0, 1.57, 3.14, or 4.71% of DM, compacted in polyethylene bags, and kept in aerobic storage at 16, 27, or 38°C for 14 d. Intermediate and high NH3 reduced temperature increases, mold growth, and spoilage and improved DM recoveries. Low ammonia grains were less stable and deteriorated faster than untreated grains.

In Experiment 2, lactating Holstein cows were supplemented with NH3-treated distillers wet grains (13.8% of total DM) or soybean meal (10.1% of total DM) for 70 d. Intakes of DM tended to be lower on ammoniated grains (19.4 and 17.6 kg/d). Milk yields (27.1 vs. 27.9 kg/d) and composition were not significantly different among treatments, but efficiency of converting feed to milk and income over feed costs were greater for ammoniated grains than soybean meal.

FOOTNOTES

1 Published with approval of the Director of the Agricultural Experiment Station as Journal Article Number 12066.

2 University of Guyana, Faculty of Agriculture, Box 101110, Georgetown, Guyana. South America.

3 Department of Animal Sciences, University of Arizona, Tucson 85721.






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Copyright © 1987 by the American Dairy Science Association ®.