Nah, ours have it in the womb. The eyelids are turned in at birth. I turn them out when I iodine the cord, then a couple more times over maybe 12 hours and that's it. It's just part of the routine. I'm now recording it to see if there's a pattern.
I've had it in lambs from all three Ryeland / Coloured Ryeland tups I've used but we had it on the farm I used to work on from Suffolk and Texel tups over Mule and Halfbred ewes.
Sorry, Bionic, I didn't mean to sound critical in my first post - was just in a hurry
Entropion was one of the issues flagged up by the RFBS as a possible issue for investigation in the genetics project it is funding but decided to look for the gene for fleece colour instead.