Observations for biological index t

Observations for biological index traits favoring decreased
birth weight and increased postnatal growth
were computed from component traits, BW, WG, and
PWG. Three index traits were analyzed, standardized
BW gain to weaning less birth weight (WmB),
postweaning BW gain minus birth weight (PWmB),
and BW gain to yearling minus birth weight (YmB),
computed from raw phenotypic means (μˆ) and SD (σˆ)