" Genetic selection for early egg production, to reduce time and money 'wasted' on feeding and housing unproductive birds for six months, results in eggs being formed that are often too big to be laid by the immature body of a small, five month old bird. Uteruses 'prolapse,' pushing through the vagina of the small, cramped birds forced to strain day after day to expel huge eggs. The uterus protrudes, hangs, and 'blows out,' inviting infection and vent picking by cell mates, from whom the prolapse victim, in severe pain, cannot escape except by dying. "

― Karen Davis , Prisoned Chickens Poisoned Eggs: An Inside Look at the Modern Poultry Industry