According to a study done on this exact thing, of the potential factors influencing poult flip-overs, only late hatched poults and slow genetic growth appeared to be important influences.
The heritability of the trait appeared to be low, so selection would not be very effective in reducing the occurrence of flip-overs.
Selection for increased egg production has led to changes in other traits, including body weight, fertility, average clutch length, egg weight, days lost to broodiness (Anthony et al., 1991; Nestor et al., 1996), and changes in egg composition (Nestor and Noble, 1995). From the current study, it appeared that increased occurrence of poult flip-overs was another correlated response to long-term selection for increased egg production.