Kev - can I post photos here? If so, I'd be happy to snap some pictures. If I remember correctly, you could see part of the chest on one of the chicks. I asked the Teacher over the phone and she mentioned the bow-tie which I read about in NN chicks. I will try to go over tomorrow to get some pics. If I can't post them here, I'd be happy to email them to you.
That was my first thought .... if it's a random mutation, you wouldn't expect TWO chicks. Their farm is actually in a residential area so no other chicks around ... it's majorly developed in that area now.
I read that NN is autosomal dominant which means the rooster or hen, the parents, had to show the trait to pass it on. SHe has no roosters or hens w/ naked necks. If a NN hen mated w/ normal rooster, statistically, half of the chicks would be NN.
I'll see if I can go over tomorrow and get a good look at all the chickens as well as how many nests the eggs came from and how many chicks were hatched.
Even more Curious