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Journal of Dairy Science Vol. 56 No. 10 1283-1290
© 1973 by American Dairy Science Association ®
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Factors Affecting Response of Lactating Cows to Ammonia-Treated Corn Silages1

J. T. Huber, R. E. Lichtenwalner2 and J. W. Thomas

Department of Dairy Science, Michigan State University, East Lansing 48823

ABSTRACT

Ninety-seven lactating cows were fed corn silages treated with urea or ammonia in two experiments. Ammoniation of silage with 30 to 42% dry matter resulted in higher lactic acid and water insoluble nitrogen than urea treatments, and urea silage was higher in water insoluble nitrogen than controls. Increases in water insoluble nitrogen accounted for 57% of the added ammonia nitrogen and 29% of the urea nitrogen. Addition of ammonia to silage with 53% dry matter or in quantity (1.86% of the silage dry matter) decreased lactate concentrations in silage. Acetic acid in silages was not consistently affected by nonprotein nitrogen treatments.

Highest milk yields in both experiments were on ammoniated silages (30 to 42% dry matter). Addition of ammcnia to silage with 53% and urea to silage with 4% dry matter depressed milk production to a yield similar to that in negative controls. Milk was slightly less for aqua ammonia than the commercial ammonia mixture. There were no differences in intake between the nonprotein nitrogen treatments; thus, conversion of feed to milk was slightly higher for cows fed the ammonia-treated silages. Neither milk fat percent nor body weight changes were significantly affected by silage treatments.

FOOTNOTES

1 Published with approval of the Director of the Agricultural Experiment Station as Journal Article no. 6247.

2 Present address: Department of Animal Science, Texas A & M University, College Station 77840.






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Copyright © 1973 by the American Dairy Science Association ®.