3 chickens losing feathers from their throats?

[Mum]

They are healthy in every other way; laying like clockwork, but I've noticed 3 of my girls have lost feathers from their throat area.

Anyone have any ideas?

 

[terryg]

My two best layers get bare throats halfway through the season. They put all of their energy into eggs and don't regenerate feathers. If they're healthy in every other way and you see no signs of pecking, I bet they're fine.

 

[Mum]

That's reassuring.

They just look so .. erm ... less than best.