nasty? a chicken will drink outa a pool of piss and love it, a chicken will scratch through manure all day, pecking through it. a chicken if given horse manure, will eat mouthfuls of it. i dare say eating oats soaked in stud urine is worse than anything else ive mentioned.
if you observe true farm raised fowl, you'd see why they are called yard buzzards. they are nastier than hogs if given the chance.