Moulting at 15 months or from heat?

[4 MimisPeeps]

I have 6 hens (various breeds) 15 months old that have all but stopped laying. They were doing just great but then 3 started acting broody, and egg production went down. Now no one is broody but it's gotten very hot here the last 2 weeks & there are feathers everywhere! They free range all day and we have lots of forsythias that they go under to stay cool. Normal age for moulting? Heat induced?

 

[redsoxs]

They shouldn't molt until their second autumn...and i don't think they "shed" like mammals. You might want to look them over close for mites or lice. Good luck to you!