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Research on Liquid Nitrogen Supplements for Dairy Cattle ^1,2

Michigan State University, East Lansing 48823³

Abstract

Conclusion: Studies comparing liquid and dry urea supplements in dairy cattle rations show no consistent advantage of one source over the other in animal performance when each furnishes equal levels of NPN. However, further research is needed with high producing dairy cows to test the limits of feeding both liquid and dry supplements containing urea. The addition of fermentation solubles (fish and distillers) to liquid nitrogen supplements has resulted in higher increases in animal gains than would be predicted from the increase in dietary protein. It is preferred that liquid supplements be added to dairy cattle rations through corn or other grain silages. This method facilitates the balancing of rations in energy and protein for lactating cows regardless of production level and minimizes intake problems due to urea.

A liquid ammonia supplement for addition to corn silage has shown promising results in dairy and beef cattle studies. Nitrogen from ammonium salts of organic acids appears more efficiently utilized by ruminants than urea nitrogen. The addition of ammonia to grain silages at ensiling time is an economical method of producing and feeding ammonium lactate and ammonium acetate to cattle.

¹ Published with the approval of the Director of the Agricultural Experiment Station as Journal Article No. 5564.

² Presented at the 62nd Annual Meeting of the American Society of Animal Science Special Livestock Session, August 3, 1970.

³ Department of Dairy Science.