The reason why hatcheries do not use that method is obviously because there is a higher incidence of physical deformities when chicks are incubated at colder temperatures. They don't have the staff or time to fix up splayed legs, curled toes, etc., like anyone taking advantage of this method to restrain the hatchability of males for an urban, backyard flock or (like me) lacking the courage to cull the roosters.
I got a hold of some fertile eggs and decided I had nothing to lose checking out the rumors here and there about getting females when the temps are cooler. Looks like all my males died, and about 50% females is no low hatch rate, considering that is pretty close to what most people get anyway.
I am not very interested or motivated to argue here with anyone on this topic. I tried it, worked as predicted for me and given another batch of eggs, I would do it again if I can prevent the hatching of males. I will post updated photos later on, to see if indeed those sexing my chicks were right and if indeed I hatched all girls.
Plain luck? All I know is I am doing it all over again, regardless of what anyone disputes..
