Better to be over anxious with chickens then not... by the time they show a problem it is often too late because they hide things so they don't get noticed as easy prey.
Good to keep an eye out still if you notice any changes... I do currently suspect they may getting ready to molt. It might look like a pillow exploded. Laying is done best at 14+ hours of light. Some people supplement light to extend laying... I do not. Each bird will be slightly different as to when they do molt, how hard they molt, how long it takes to return to lay and such.
Instead of adding light... I add a few new layers each year that won't be molting at the same time as my older gals (hopefully). And of course I rehome a few slightly older birds to make room.
Also.. noting your breeds are dual purpose... I would choose a flock raiser or grower with oyster shell on the side instead of layer if that is what they currently eat. Dual purpose birds do better with at least 18% protein, while 16% in layer is the minimum to sustain light bodied layers like leghorn. Also too much calcium (>3%) fed long term to birds not in lay like molters, juveniles, broody's, roosters and such... *can* (doesn't mean will) cause gout or even kidney failure. It is most likely in birds that may be genetically predisposed or those fed excessive treats. For this reason I always feed flock raiser (20% protein) with OS on the side for layers.
I do see my molting birds return to lay sooner than when I used to feed layer... they have more in their tank... feathers are made of 90% protein and it amino acids... Too much protein (usually 35%+ LONG term) can also cause a different type of gout/kidney failure.
My favorite treats (means less than 10% total daily ration) are scrambled eggs and meal worm, when nutrition is important... like during molt or times of stress.
Welcome, I hope you enjoy BYC as much I have!
