J. Anim Sci.
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J. Anim Sci. 1979. 48:144-156.
© 1979 American Society of Animal Science
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Nutritional and Economic Value of Animal Excreta1

L. W. Smith2 and W. E. Wheeler3

U.S. Department of Agriculture, Beltsville, MD 20705

Abstract

Animal excreta products contain 48 to 73% TDN, 20 to 31% crude protein, 13 to 20% crude fiber, .9 to 8.8% calcium, 1.6 to 2.5% phosphorus, .4 to .9% magnesium, and .5 to 2.3% potassium. The products range in value as sources of plant nutrients from $24 to $39 per metric ton of dry matter. Their value as a feedstuff ranges from $113 to $173 per metric ton when soybean meal cost $221 per metric ton of dry matter and $116 to $254 when soybean meal cost $369 per metric ton of dry matter. In both nutritional and economical terms, poultry litter had the highest value and cattle excreta the lowest. The nutrient content of animal excreta and constraints placed on the computer program limited their use from 15 to 34% of the total dietary dry matter for selected classes of ruminants. Constraints on the computer program met or exceeded the nutrient requirements established by the National Research Council. The computed value of the excreta products when soybean meal cost $221 or $369 had little effect on the level used in diets for lactating cows or finishing steers. In production trials, animals have performed satisfactorily on diets containing animal excreta and thus evidence of their value as feed ingredients has been provided. However, valid nutritional compositions of excreta products are essential to formulate balanced diets, and the resulting diets must be consumed by the recipient species at levels to achieve desired levels of production.

Footnotes

1 Paper presented as part of the Symposium on Alternatives in Animal Waste Utilization at Annual Meeting of the American Society of Animal Science, University of Wisconsin, Madison, July 23 to 27, 1977.

2 Feed Energy Conservation Laboratory, Animal Physiology and Genetics Institute, SEA.

3 Ruminant Nutrition Laboratory, Nutrition Institute, SEA.






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Copyright © 1979 by the American Society of Animal Science.