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 punctured eardrum can leave the middle and inner ear vulnerable to infection. If liquid or debris is allowed to penetrate the middle ear through the punctured eardrum, infection can occur, causing pus to begin accumulating in the middle ear and draining from the ear canal 24 to 48 hours after the ear injury occurs.