A stillborn piglet was defined as a piglet born without any respiration, potentially with a heartbeat. Mummified and degenerating piglets were excluded from TNB. All piglets, born alive or stillborn, were individually weighed and identified within 24 h after birth (BW d 0). Individual piglet weight was determined again at 72 h of age (BW 72 h), i.e., 48 h after the first weighing and at weaning. Uniformity of the litter was expressed by the SD of the individual piglet weights per litter.