RE-Cycle: A profitable swine production system with zero waste
By Theo van Kempen, Swine Nutrition Specialist, North Carolina State University - Traditionally, pigs were fed household waste, while their manure was used as a fertilizer for crops. Although it may not have been realized at the time, this system resulted...

Ultimate Recycling: Ash from burned manure used as mineral feed source
By Theo van Kempen, Swine Nutrition Specialist, North Carolina State University - Traditionally, pigs were fed household waste, while their manure was used as a fertilizer for crops. Although it may not have been realized at the time, this system resulted...

Biogas - An overview
By Brian Sexton, Alberta Agriculture, food and rural development - This article provides a brief overview of the principles and economics of producing biogas as a by-product of hog production.

Biogas production using anaerobic digestion of cattle and pig manure
By Guillermo Escobar and Matti Heikkila, OPET Finland - This report from the OPTEC Network gives an overview of energy recovery from pig and cow manure using anaerobic digestion....