I got chickens in first week of March. I was expecting the chickens to start laying eggs at about 23-25 weeks. However, I found an egg this afternoon lying at the edge of the run. It was pretty small as you can see from the picture. When will they get bigger? Also, should I now start the egg layer feed? I have 18 brown egg laying chickens (buff orps, black australorps, barred rock, white rock and rhode island reds) How many nesting boxes should I give them, and where should I put the nesting boxes?