This is just my opinion, but all my birds sleep in the dark because, I dunno, it just seems to me it mimics the wild. Plus, I don't want to pay that light bill! LOL.
I agree with mimicking the wild/nature, which ties into the laying issues that I pointed out... Guineas are seasonal layers (regulated by the shortening and lengthening of daylight hours), and so if there's a light on all the time in their coop they can start laying eggs before they would normally, and they will typically lay a lot later into the season as well. This can lead to Hens that deplete the limited number of eggs in their ovary too quickly and completely stop laying well before they should. That doesn't work out in my flocks, if a Hen stops laying, she's just eating money. Egg/keet/bird sales pay the way for my flocks... each year I have to make enough to cover the cost of their feed and the building supplies for their housing. But not everybody manages their flocks the way I do tho, and I'm in no way saying they have to. Just pointing out that some things (and their consequences) are easily overlooked, even when done with the best intentions of caring for our birds.
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