This is an artifact of the method used to calculate
LSY.
Calculating LSY may present a challenge when attempting
to use LSY in a selection program for females that have not
remained in the breeding herd for at least 1 year and produced
two litter records during this time.
These gilts have not had sufficient
time to fully express their phenotype for LSY; therefore,
the LSY values assigned to these gilts do not truly represent
their genetic potential.