Jay Green wrote:This time of year the egg shells can be thin and brittle, as chickens are redirecting calcium to regrow feathers shed in the molt. Time takes care of this. Collect eggs each day to avoid build up of eggs in the nests. Provide additional nests if you only have one. Start placing eggs in the nests they do not use and leave them for the next day...the chickens like to lay where others have laid eggs. Pretty soon they will start using other nests also.
You can also construct roll away nest boxes that keep each egg safe as soon as it is laid.