Each feedstock that can potentially be used in an anaerobic digester to destroy the material, usually a waste stream, and produce energy has its own energy characteristics. The data in the following chart developed by Dr. Mathias Effenberger and presented at the Mars Centre in Toronto in 2006,  specifies the energy values of many different feedstocks. While farm manure is shown to produce the least energy, a farmer can substantially increase its biogas yield by blending in other feedstocks. Industrial applications aimed at producing the maximum energy output generally use feedstocks from the mid point in the chart and up, resulting in an exponential increase in the  output of biogas (methane plus CO2). Most energy intense of all waste stream feedstocks are bakery residues.

Manure Slury	Vegetables

Digester loading depends on the feedstock and the percentages of solids content. As a rough guideline for livestock, the following chart can be used.