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It slows normal development and leads to a higher incidence of curled toes and longer necks with malpositioned heads, and late hatches. However, again this something that's only been studied in extremely fast growing breeds. It's possible that the outcome could be better or even worse with other...

There have been studies done on broiler chickens being selectively bred for particular genetic markers and then they lower the incubation temperature to make it more difficult for males to develop properly, so they are then stuck in the egg because they are malformed. I think it's kinder to sell...