Bought 9 chicks back in May. 3 White Leghorns, 3 RIRs, and 3 Welsummers. All are laying pretty reliably except for 2 of the Welsummers. They're not laying at all. I've had chickens for several years, several flocks. This is my first experience with Welsummers and the 1st time I've had part of the flock not lay eggs. Any ideas?