Cow flatulence and peanut allergies were not a thing when I was a kid.
My ornery uncle was a farmer and kept cows and unless they’re out in a suitable field with lots of room rather than cooped up in a barn, the resulting manure and urine can be overpowering. Uncle let him out but still it was just as odiferous as pigs as far as I was concerned.
Peanuts on the other hand and allergic reactions to peanuts is an interesting topic, I have read that it might be due to the vast amounts of herbicides and insecticides used that permeate the root systems, which is the peanut and people are possibly experiencing a reaction to those.
I also read recently that there is growing interest in boiling peanuts and eating boiled peanuts to combat the effects of these peanut allergies.