Performance data from a Polled Hereford
herd selected for feed conversion were used
in the calculation of heritabilities and genetic
correlations for birth weight (BWT), weaning
weight (WWT), and yearling weight (YWT).
Direct heritabilities for BWT, WWT, and
YWT were .31, .16, and .25, respectively.
Corresponding maternal heritabilities for
BWT, WWT and YWT were .04, .01, and
.18, respectively. With the exception of the
correlation between WWT and YWT (.98),
the other genetic correlations were low to
moderate, ranging from -.27 to .12.