References 1. Kansas State University (KSU) 2. Energy Center of Wisconsin, Energy Efficiency and Customer-Sited Renewable Energy, ECW Report Number 235-2, Oct. 2005 3. Scott Sanford, Univ. of Wisconsin Extension 4. Univ. of New Hampshire Cooperative Extension (2002) 5. Oregon State University (OSU) 6. Animal Production and Health Paper 78, Food & Agriculture Organization 7. Pennsylvania State University's (PSU) Agriculture and Biological Engineering Dept. 8. New York State Cooperative Extension Service 9. Pennsylvania State University (PSU) 10. University of Nebraska - Lincoln . References 1. Kansas State University (KSU) 2. Energy Center of Wisconsin, Energy Efficiency and Customer-Sited Renewable Energy, ECW Report Number 23 5 -2, Oct. 20 05 3. Scott Sanford, Univ. of Wisconsin. Univ. of New Hampshire Cooperative Extension (20 02) 5. Oregon State University (OSU) 6. Animal Production and Health Paper 78, Food & Agriculture Organization 7. Pennsylvania State University& apos;s. University& apos;s (PSU) Agriculture and Biological Engineering Dept. 8. New York State Cooperative Extension Service 9. Pennsylvania State University (PSU) 10. University of Nebraska - Lincoln