J. Anim Sci.
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J. Anim Sci. 1979. 48:157-162.
© 1979 American Society of Animal Science
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Processing and Handling of Animal Excreta for Refeeding1

D. L. Arndt2, D. L. Day3 and E. E. Hatfield4

University of Illinois, Urbana 61801

Abstract

The feeding of nutrients contained in animal excreta is the most valuable use of these recoverable resources. Utilizing animal excreta as feed nutrients can alleviate pollution problems, decrease feed costs and increase the supplies of available nitrogen and essential mineral sources. Ruminants appear to be the ideal target animals for the practice of refeeding processed animal excreta. Due to their symbiotic relationship with the microbiota occupying the rumen, they can utilize fiber, nonprotein nitrogenous compounds (NPN) and nucleic acids to a greater extent than nonruminants.

This paper reviews the "state of the art" of collecting, processing and incorporating excreta into the diets of livestock (mostly ruminants). It briefly covers the most commonly used methods of processing animal excreta, including: drying, composting, ensiling, chemical treatment, aerobic treatment production of single cell protein (SCP), and liquid-solid separation. It also reviews work related to the losses of essential nutrients in animal excreta.

Animal excreta must be harvested frequently after deposition to reduce protein equivalent losses, i.e., volatilization and leaching of nitrogen. Animal excreta must be processed to improve animal acceptability, destroy pathogens, and reduce odors. Incorporating processed animal excreta into the diets of ruminants is advantageous to the economic production of beef as well as being a reliable pollution control measure.

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 Research Assistant, Animal Science Department. Present address: Texas Tech University, Lubbock 79408.

3 Professor, Agricultural Engineering Department.

4 Professor, Animal Science Department.






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