We ran a batch of chicken eggs in our incuview to replace or laying hens. They are 4 months old and out of the 14 that hatched 10 are roosters:smack I have read that the bator temps can determine the sex but haven't seen what temps. Is this true? Or is it just a luck of the draw? I have also read that the hen will determine the sex if say there isn't enough roos around but I thought there should only be one. If I remember correctly ( and I rarely do )we could only put in 22 eggs instead of the 27 that they say will fit because some of our eggs are so big so it kinda cut down no our odds of having more hatch. We have some more chicks that are about 2 weeks old but of the 22 or so only 9 hatched so we will have to see how those turn out. Also we have had a few hatches from a broody hen and normally the roos are trying to crow by 4 months but not these. At what age do your's start to crow? We aren't supposed to have chickens the last time I checked but the neighbors don't complain and our rooster can't crow. So we gotta put these in the freezer before they get crowing.