The fat tailed sheep have been domesticated for several thousand years, possibly originating in Mesopotamia. They are still cultivated in Turkey and other parts

The fat tailed sheep have been domesticated for several thousand years, possibly originating in Mesopotamia. They are still cultivated in Turkey and other parts of the Middle East, IIRC. I was always curious how long it takes that type of mutation to become a distinct strain (e.g. how many generations from the first sheep herder that saw a sheep with a fat tail and decided, either consciously or otherwise, to breed it and continue to select offspring with fat tails until it no longer required selective propagation to persist).