Note how the non-crested hens have similar markings but opposite dark and light patterns on the head.
Another big advantage is to have the male with the hens at the right time. If you work, the timing can be difficult first moving him in with one hen in the morning and then moving him to the other that evening. Only realizing where he needed to be after the fact.... Because they are all in the same cage and they are not being disrupted everyday by his moving, there is a higher fertility rate.
Two padded nests are place on opposite sides of the cage with a tuff of nesting material in each. Usually the hens will pick different nests. Sometimes, if they seem interested in the same nest, I temporarily put three nests in the cage for more choices until the hens pick their nest.
A few years ago, when I first tried multiple hens with one male, I would try to pick two hens at approximately the same stage. I still like to do that but I have found it not a problem as long as new babies are not being hatched when the other hen has babies leaving the nest. When chicks leave the nest, they are disruptive and are anxious to change nests and be fed by any bird who will feed them.
The older hen in this pair was set today and the younger one will likely lay very soon. I will continue feeding nestling food till the second hen is set and again feed it when the older hen hatches her first baby. Even though nesting food is offered, the birds know when they should eat it!
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