I can't tell: do they have the layer feed available all the time?Food: I feed them fermented 16% layer feed and then turn them out into our pasture for the day where they get grass and bugs all day. They get some treats, but pretty much only fruits, veggies, and the occasional mealworms. I'm extremely strict about carbs. They do get a couple small handfuls of corn to bribe them home at night. I have crushed eggshell on offer for them to get calcium.
Or do they only get it in the morning, and then eat it up and have empty feeders for the rest of the day?
If they are running out partway through the day, they may need more total feed than what they are getting. If it is always available, then of course that is not your problem.
Have you tried locking them into their coop for about two days? That will probably give a good answer to whether they have hidden nests, and whether any other kind of animal might be stealing & eating eggs.Habitat: They have a nice coop with plenty of space and several nest boxes. Our pasture is about 1 acre and they share it with our goats. The pasture is mostly open, with only two pine trees and a tire playground for the goats. I have searched in the pine straw around the trees and looked inside every tire for hidden nests. The chickens cannot get to the goat sheds to lay in there.
https://www.backyardchickens.com/articles/who-is-laying-and-who-is-not-butt-check.73309/
You can usually tell who is laying by checking their butts (vent size/shape, and distance between the bones there.) You could take a flashlight after dark, grab each one from the roost, and have a look. The difference between layers and not-layers is usually pretty obvous. If you have a rooster, he is a good example of a not-layer. The hen with the biggest red comb is probably a good example of a layer.
Calcium can make a big difference in whether there are any eggs for you to find (softshell eggs usually get broken & eaten). The layer feed should be providing about the right amount of calcium, but I would definitely try to keep eggshells or oyster shells available too.I used to be really bad about putting eggshell out, but I keep it on offer almost all the time (there are occasions where they go a few days without).
That would depend on the medication. If it is amprolium, then yes it is safe for you to eat the eggs from the hens.Hm, I didn't even think of chick feed. The only chick feed I can get a hold of at a decent price is medicated. I know you can't drink goat's milk if they're fed medicated food, do you know if you can eat the eggs of hens on medicated feed?
Chick starter does not have as much calcium as layer feed. So if you give them chick starter, plan to buy some oyster shell and keep it available at all times. Chick starter with no extra calcium would only have about 1/3 as much calcium as layers need.