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.
Sometimes a middle ear infection causes a hole (perforation) in the eardrum. A hole that does not heal within six weeks is called chronic otitis media. This problem can take one of three forms: Non-infected chronic otitis media â There is a hole in the eardrum but no infection or fluid in the middle ear. This condition can exist indefinitely. As long as the ear remains dry, the middle and inner ears can remain stable for years. Repairing the hole is only necessary to improve hearing or to prevent infection.