Searching for info on this showed that it is done to many merino sheep, but the Australian The Department of Primary Industries and Regional Development (DPIRD) agreed in 2004 to phase it out.
What happens (as a once-off) is when the sheep are collected and marked, that a strip of skin (not chunks of flesh) is removed from each side of the anus so that the healed scar tissue smooths out the wrinkles in the skin. Merino sheep have a lot of wool and a very wrinkly skin. Flies strike in the wrinkles and can kill in two weeks.
There is a push to breed sheep with fewer wrinkles and with less wool around their bum to get mucky. Full instructions on how to rate your sheep for wrinkliness of skin and hairiness of arse are in the article at
www.agric.wa.gov.au/livestock-parasites/managing-non-mulesed-sheep
Good Morning Thursday 9th July 2026
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