The Perendale originated in New Zealand from crossing the Border Cheviot with the Romney breed. They are an open-faced, medium-framed breed that produces bright, lofty, long-stapled, medium-wool fleeces. Developed as an easy-care sheep, they are both hardy and highly adapted to marginal forage-producing areas.
It depends how badly the eardrum is ruptured. Mine ruptured a couple of years ago from a bad ear infection, and it took me at least 3 weeks to get the ringing out of my ear. Depends a bit of how good you protect the ear from pressure changes; usually between 2 - 4 weeks. If you really do have an ear problem, do NOT mess 'round.
A perforation is a hole in the eardrum. Eardrum perforations are caused by middle ear infections and injuries. Perforation causes sudden ear pain, sometimes with bleeding from the ear, hearing loss, or noise in the ear. Doctors can see the perforation with an otoscope. Usually the eardrum heals on its own, but sometimes surgical repair is needed.