It's possible, then again not at all. It all depends on the cow's diet, and how such measurements are obtained, if they can be successfully obtained without any outside influences which may skew the results.
Yes. They can produce more or less, depending on their diet.
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A cow farts.
65poo
Cow dung Decomposed waste material Volcano
Methane, carbon dioxide, nitrous oxide, same kind of gas any animal lets out if they got flatulence or have to burp.
It depends on what is fermenting. Cow poo, produces methane. Fruits produce alcohol.
Methane is separated from cow dung by subjecting the cow dung to a heat source. From there, methane can be used as an energy source for generating electricity on a farm.
Get bred and produce a calf.
Methane digester
A cow lets out Methane when it farts.
A cow releases between 70 and 120 kilograms of methane a year.