quote:They didn't claim they did; see 2nd paragraph. They are attributing it to ruminants (cows etc) Quote The digestive process of ruminants is an important source of methane. The quantity of methane produced depends largely on the crude fibre percentage of the feed - the higher the crude fibre content, the higher the methane emission as a percentage of the gross energy intake. Methane emission levels from the digestive process in pigs and poultry are low.
Originally posted by Pablo: That site jumps to some false conclusions. Chickens don't fert (much).