- Thread starter
- #32,811
If a hen is just going to be laying eggs, then a dark environment mat not do any harm.My feeling when it comes to coops:
Well-ventilated, yes.
Bright, no.
Coops are bedrooms, meant for sleeping and nesting, both of which commonly occur in relative darkness. The rest of their run and the yard are for the daylight hours.
There is a streetlight on the side street that shines on the coop and indirectly into our bedroom. The moon also rises on a different side, shining into the bedroom. It’s lovely and all, but I’d really rather not be awakened at 4 by a shaft of moonlight!
Interestingly though the most popular egg laying site was the nest box in my house and that was exposed to lots of sunlight. It was also quite popular for sitting and hatching.
But, if a hen is expected to sit and hatch then daylight exposure is very important.
I've got some full studies on the topic somewhere but my digital non filing system is such a mess it could take me hours to find them.

This will give a start,
https://lohmann-breeders.com/lohman...r-health-and-performance-of-domestic-chicken/
There is quite a lot of information on the net on this topic once one has got past the usual crap that gets thrown up.
Every study I read came to the conclusion that daylight (and apparently artificial light in some case) was a major positive factor in egg development.
One study suggested that chicks hatched in nests exposed to periods of light had less aggressive behaviour toward their siblings but, because of the complexity in proving such a claim, no evidence was given.
I'm with BDutch on this one and one of the first things I did with the recycled plastic Solway coop was to cut a window in the human access door at the back of the coop
I prefer to have



They were only just settling down when I left tonight, 40 minutes after sunset.

she ran up for lunch when I went outside so I nabbed a photo of the nest.
When we sneak out an hour later than we should have, they just glare at us reproachfully. 

