2026-07-07http://hdl.handle.net/123456789/475811As an adjunct to monitoring body weight changes and body condition score, blood or milk urea nitrogen (BUN or MUN) can be a useful tool for monitoring the protein- energy status of cattle. In healthy beef cows or finishing steers, urea nitrogen concentrations of less than about 7 mg/dl would indicate a deficiency of dietary protein (nitrogen) relative to the intake of digestible energy. In rapidly growing cattle or high producing dairy cows, urea nitrogen concentrations of less than about r5mg/dl indicate a relative deficiency of dietary protein. Urea nitrogen concentrations of greater than 19 to zo mg/dl have been associated with reduced conception and pregnancy rates in dairy cows.application/pdfCiencia y Tecnología AgropecuariaAgrocienciasartículo científico