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PROPOSED BEEF CATTLE MANURE EXCRETION AND CHARACTERISTICS STANDARD FOR ASAE
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 269-276 in the Ninth International Animal, Agricultural and Food Processing Wastes Proceedings of the 12-15 October 2003 Symposium (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1203.(doi:10.13031/2013.15261)
Authors: G. E. Erickson, B. Auvermann, R. Eigenberg, L. W. Greene, T. Klopfenstein, and R. Koelsch
Keywords: ASAE standards, manure, nutrient excretion, beef cattle, modeling
Average excretion values for DM, OM, N, P, Ca, K, Na, Mg, S, Cu, Fe, Se, Zn, Mn, Co, and I expressed for the entire 153 day period or per finished steer are 270 kg, 220 kg, 24.8 kg, 3.2 kg, 7.8 kg, 9.2 kg, 1.8 kg, 2.7 kg, 2.4 kg, 19.4 g, 68.9 g, 0.27 g, 96.1 g, 49.1 g, 0.31 g, and 0.93 g, respectively. In some cases, the new values are much lower than current standards. For example, P excretion is 6.3 kg for the average steer weighing 446 kg (average live weight) fed 153 days based on the previous standard. The revised P excretion based on intake minus retention is 3.2 kg or 50.8% of the previous standard. The proposed excretion values should allow for more accurate planning and allow users to tailor excretion to site-specific situations by incorporating cattle performance, days on feed, weights, and nutrient content of diets.
While the previous standard does not account for variation, considerable agreement was found between the current intake minus retention model for excretion and the previous standard. Excretion of DM, OM, P, and Ca were identical between the average excretion estimate using the current model and the previous standard for calves gaining 0.9 kg per day, weighing 295 kg. "/>
A committee was formed consisting of both animal scientists and agricultural engineers to
evaluate and update current ASAE standards. An intake minus retention model was developed to
estimate nutrient excretion. This approach allows users (producers, engineers, etc.) to develop site
specific information based on known variables such as protein or phosphorus content of diets and
cattle performance. This approach illustrates the importance of nutrition on nutrient excretion in
livestock operations. Our focus is for feedlot cattle and updates excretion of dry matter (DM or
total solids), organic matter (OM or volatile solids), N, P, Ca, K, Na, Mg, S, Cu, Fe, Se, Zn, Mn,
Co, and I.