I have got a bit of a silly question. We have been keeping chickens noe for 3 or 4 years and feel very competent in most areas of chicken keeping. We have tryed hatching some chicks off the last two years under a hen and have hatched 9 chicks off over the two years. 6 in last year and 3 this year and every single one has been a cockerel. Is this just a coincidence or is there more to it. I have been told that the sex is determined by the temperature during incubation, is there any truth in this.