Animal Science, Department of


Date of this Version



Published in 2021 Nebraska Beef Cattle Report, University of Nebraska Extension Publication MP110


Copyright © 2020 The Board of Regents of the University of Nebraska.


Manure collected from open lot animal housing systems experiences variability due to weather conditions, management of beef cattle and pens, and other factors resulting in substantial changes in manure characteristics. Data from 15 winter and summer periods at the beef feedlot at Eastern Nebraska Research and Extension Center including 416 independent pen measurements, were summarized for nutrient mass balance, and then used to determine sources of variability impacting nitrogen and phosphorous. Understanding variability is important to regulated manure nutrient planning processes. The results of this review suggest significant challenge associated with planning based upon standard values for estimating manure characteristics. Nutrient planning estimates based upon site and time specific manure analysis is critical for open lot beef systems.