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The Value of Refuse Screenings as a Feed for Livestock¹

The State College of Washington²

Abstract

1. A study has been made of the chemical composition, apparent digestibility, and TDN content of refuse screenings.
   
2. Studies were also conducted on the numbers and kinds of weed seeds present in the ground refuse screenings and the viability of these seeds both before and after being subjected to the process of digestion.
   
3. The chemical composition of the refuse screenings studied was: dry matter, 90.4%; ash, 8.7%; ether extract, 6.8%; crude protein, 14.5%; crude fiber, 15.6%; and nitrogen-free extract, 45.1%.
   
4. The refuse screenings had a TDN content of 58.4 when fed alone and 61.6 when fed with alfalfa hay.
   
5. Feces voided on a diet of refuse screenings alone contained no viable weed seeds.
   

¹ Published as Scientific Paper No. 845, Agricultural Experiment Station, Institute of Agricultural Sciences, State College of Washington, Pullman.

² Division of Dairy Husbandry. The authors are grateful to the Department of Animal Husbandry for furnishing the ewes and metabolism cages used in this experiment and to Dr. R. W. Colby of that department for his assistance and helpful suggestions. Further acknowledgment is made to Dr. L. W. Rasmussen and Miss Mary Haferkamp of the Agronomy Department who conducted the germination studies.