The anti afk check is timed in such a way 10 mins would not be enough to boot a bull. as anti afk have to check multiple times if someone missed a popup once. Anti afk was made to be slower and less invasive than original so 10 mins is not enough time to do a valid anti afk check.
Standard afk checker, cows get it every 5 minutes, Bulls do (if they are Milking) but not when they are Breeding. As Breeding is important then I would suggest if a Bull fails to Moo the second time (which would be after 10 Minutes in most cases) then they can't breed for an hour.