I bought my hens when they were chicks from the local livestock/food place. I have 3 RIR, 1 plymouth rock, 1 ameracauna, 1 comet. They have been laying since last November but they have not gone broody yet. I instroduced a rooster 3 weeks ago and they mate. Do you think their maternal instinct has been breed out, through repeated artificial hatching and brooding?