There are many tests published on the methane yield of cattle manure, both using batch tests
with inoculum and tests with continuously stirred tank reactors [CSTR]. These tests have a variation in
methane yield of 130 - 300 l/kg volatile solids [VS], influenced by the freshness of the manure, diet of
the cattle (composition of the manure), temperature of digestion, the type of inoculum, ratio between
inoculum and manure, solids content and the length of the testing period. In most cases only a few of
these parameters have been documented.