When we raised alot of peacocks we had nest boxes for them to lay in.
We used rectangular open top wooden boxes or the ends of plastic barrels. The boxes were about 16 inches wide, 30 inches long and about 12 inches deep.
After attaching to a wall in the coop, we put about 2 to 3 inches of sand in the bottom, then some wood chips and a little straw. The sand on the bottom and the wood chips help the hen to be able to make an impression without digging all the way down to the flat board.
If there is not enough bedding in the nest the hens will have a hard time keeping the eggs underneath themselves when they try to incubate.
Hens will lay eggs on the ground if they don't have a raised box to nest in. Generally in a corner or behind something. But the advantages of nesting off the ground are not being disturbed by others, nests that don't flood in heavy rain, and the eggs contained in one spot.
You want to keep the nests at a level lower than the roosts so the birds don't use the nest as a roosting spot at night.
If the hens are not comfortable or don't feel secure to make a nest, they will drop eggs around the pen or off the roost.
Randy
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