I have 2 girl that were hatched April 15th (one is a golden sex-link, and the other is a Barred Rock), I also have a RIR that was hatched April 1st. My RIR has been laying for at least a month now, and the other 2 have not started laying. Do I need to add light to their coop to get the other 2 to start laying? I really wasn't wanting to add artificial light during the winter, but I really don't want to wait till spring for these other 2 girls to get started...any advice? Do you think they will start laying during the winter without the light? Thanks so much!!