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.
Because it is so thin, the eardrum can be ruptured or perforated, exposing the ear to damage or infection. The main causes of perforated eardrum are infection of the middle ear or trauma to the ear or head. Symptoms and signs of perforated eardrum include. ear pain, vertigo or dizziness, hearing changes or hearing loss, ringing in your ears (tinnitus), or. fluid or blood draining from the ear.