This may be of interest. I stumbled upon it as a link from a jazz/blues lyrics site. It seems to be exhaustive on the subject - it includes a section on animal farts, reading lists, a treasury of childhood fartlore, definitive dictionary of words for 'fart' etc.

click here

In case the clicky thing doesn't work the URL is:

http://www.heptune.com/farts.html

--Stewie.