There's no way I will be out there at early dawn to get the birds out of their coop, and so there's always water, on a heat plate in winter in the coop areas. Good ventilation matters!
I also have a thermometer/ hygrometer in each coop area, so I know how the humidity is compared to outside...
Already good advice, and I'll add to the 'must have good ventilation' advice, closed coops with heat are a bad idea!
Also, open 'dog bowl' type water dishes are not good in freezing weather, two reasons: some birds will put a foot in the water, and freeze toes or feet, and those big rooster...
Venting about ticks!
We have them here, in our yard, don't need to wander in the woods at all. Within the last year, I've had five deer ticks attached to my delicate self, had them all tested and two were negative for the five nasty diseases they commonly carry. Three 'only' had Lyme disease...
Two flocks found with AI in Ottawa county, Michigan in October. The west side of the state near Lake Michigan. Migrating birds strike again!
Mary
Also a flock in Allegan county in September. :barnie
Wood pieces cut to fit between each 2"x4" rafter, and that still leaves openings where the metal roof 'waves'. Better, but not enough.
Is this structure up to your winter snow/ ice load? It looks underbuilt to me (not a builder though). Maybe add more framing for support? Ours is up to code...
First we will be moving our horses (down to four!) to their winter field, and then the chicken coop gets it's winter vinyl wrap. Maybe both tomorrow? Probably not...
The bantam chicks from mid September are doing fine, feathered out, and ready to explore more at the coop. Free range? Scary...
Also, what type of feed, and are you checking the mill dates on each bag? All good advice already here, and stop feeding the cracked corn, it's yummy but not a complete feed, so should only be an occasional treat in limited amounts.
Do you have oyster shell and grit in separate containers out...
Welcome!
They are very close in age, so should be okay, unless the younger birds are tiny bantams, or there's a huge size difference.
Having them all move to a new brooder, so everyone is in a new space, helps a lot.
Disease issues? Anything that makes you nervous about this, is another...
Keep using the fenbendazole! Herbal products just don't do what's needed, not worth it at all.
Did you have a fecal test run? Then you will have a better idea what you are aiming for with your worming program.
I agree that the five day plan is best, and repeat in two weeks. Worming each...
I do have a light on in one section of my coop, and that's where all my birds want to roost, although they have two other roost locations, not lit. One 25w bulb up high on a timer, 4am to 8am every morning, all winter.
The little darlings are mostly through their fall molt, and some hens...