I have a very reliable and lovely hen who has always laid regularly, even when whe was being picked on by some of the other birds. I am not sure what variety she is, but she is over 3 years old and has never moulted. Some of her wing and tail feathers are very degraded and just spikes really and she looks like she could really do with a lovely new coat! She is capable of growing new feathers as I had to isolate her for a while to regrow some shoulder feathers that had been pecked off by the others. Do some chickens simply never moult? I had a chicken of the same age unfortunatly die earlier this year and she too had never moulted. This is in contrast to another one of my hens who first moulted at 9 months and now has about 2 broody sessions a year that last for months that are followed by a full moult! Crazy creatures!