Data for number of piglets born alive (NBA), the number of alive piglets in 21st day (N21), the age of gilt at first farrowing (AFF) and the interval between two successive litters (IBTSL) were obtained from 8 successive litters.
Data for numberof piglets born alive (NBA), the number of alive piglets in21st day (N21), the age of gilt at first farrowing (AFF) andthe interval between two successive litters (IBTSL) wereobtained from 8 successive litters.