***I don’t think chickens fart***
But their manure releases HUGE AMOUNTS of AMMONIA.
Stench, from worst to least...from my memory...
Hog. Absolute worst stench.
Chicken. Even worse when it is sour.
After a while you can tell by the smell what is being spread on the fields, even ten miles away.
Farm boy here. At one time or another, we raised chickens, cattle, a few hogs, one cow-horse.
The chickens we raised thousands at a time. Put down bagasse on the floor (sugar cane stalk residue). Soaked it all up and stayed nicely dry. Let it compost for a year, shovel it out.....WONDERFUL for the garden.