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Buffelgrass (Cenchrus ciliaris), bermudagrass (Cynoclon clactylon) hays, corn stover and corn cobs (Zea mays), with a moisture content of 50%, were ammoniated with feed grade urea at 0, 4.5 and 6.0% DM. Ammonia-treated forages were stored in plastic bags during 21 days. Crude Protein (CP), Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), hemicellulose and cellulose were determined. The rate and extent of dry matter and NDF loss was estimated using the nylon bag technique. Rumen cannulated Pelibuey>< Rambouillet sheep were used to incubate the nylon bags. During the trial, sheep were fed ad libitum 70% sorghum Sudan hay and 30% alfalfa hay. The CP content in buffelgrass hay (4.4, 9.9 and 16.3%, respectively) bermudagrass hay (6.2, 13.8, 22.9%), corn stover (7.4, 12.3, 15.6%) and corn cobs (3.0, 11.2, 16.7%) increased as urea treatment augmented …