I'm going for eggs from the Red stars and the Plymouth Rock will be parents for black sex link.. I will buy Production red male for the rocks to hatch my black sex links, I made kerosene incubator... it takes 120 eggs. Yes, I did the beaks first 8 days... I was supposed to repeat on their 12th weeks but it looks ok to me... Should I repeat? . They said 100 birds for 200 square feet I have 117 birds in 220 square feet so I guess it overcrowded.. should I extend my coop or they will be fine? many thanks for your advice.