Table of Contents
ISRN Renewable Energy
Volume 2012, Article ID 723829, 5 pages
Research Article

Energy and Nutrient Recovery from Cattle Feedlots

1U.S. Meat Animal Research Center, P.O. Box 133, Clay Center, NE 68933, USA
2Texas AgriLife Research, 6500 Amarillo Boulevard W, Amarillo, TX 79106, USA

Received 25 August 2011; Accepted 3 October 2011

Academic Editor: E. R. Bandala

Copyright © 2012 Roger A. Eigenberg et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Selective harvesting of manure can benefit cattle producers by creating a product of value. A tool that identifies locations of manure accumulation has been developed using a subsurface sensor (Dualem-1S, Milton, ON) and software designed for salt mapping (ESAP, Riverside, CA). The combination allowed the development of models to estimate higher heating value (HHV) of feedlot manure across a feedlot pen. Soil sample data from cattle feedlots in Texas and Nebraska were analyzed for volatile solids (VSs) then combined with the Dualem-1S apparent soil conductivity ( E C a ) data to produce models having correlations between associated E C a values and VS ( ๐‘Ÿ 2 = 0 . 8 6 9 , VS). A corresponding model is under development to estimate the moisture content of the collectable solids. The combined models allow real-time spatial estimates of HHV within a feedlot pen. These methods will allow direct harvesting of VS for use as a recoverable energy source through direct combustion or cocombustion.