The utilization of 'as-collected' and processed beef cattle and dairy cow manure, manure screenings and anaerobically digested cattle manures was evaluated on the basis of the results of feeding trials reported in the literature. The maximum level of incorporating these manures into animal feed rations, i.e. that level that neither enhanced nor adversely affected animal performance as compared with the controls, was low, with many of the levels at, or close to, zero. A possible exception was the replacement of corn with ensiled beef cattle manure. The use of beef cattle manure as feedstuff frequently resulted in poor animal performance and its economic value as a feedstuff was generally less than its value as a fertilizer.