Hmm.. Well, I don't know if you live on a farm or if they are kept in a coop all day or what but they need at least 14 hours of daylight in order to sustain egg production. It also could be if you are giving them the wrong food. Feed them layer with 16-18% protein. Also, don't give them table scraps, whole grains, or scratch feeds, (these can offset a balanced diet.) Also, I don;t know how old the bigger hen is, but hens lay 50-60 eggs per laying cycle for two laying cycle pretty efficiently with molting in between. Once they get older, they will lay less often and provide less. Another thing could be stress. If you just moved, if there's predators, a big change in enviornment, or anything along those lines. Some other things could be predators/snakes eating the eggs, the chickens eating the eggs themselves, if the eggs keep breaking, or if they are hiding the eggs.
