The performance of bulls (n = 656 for
Angus and n = 1343 for Simmental) at the
Beloit and Potwin bulls tests from 1989 to 1992
were compared to their expected progeny
differences (EPDs). In general, correlations
between on-test ADG and weaning and
yearling EPD were low for both breeds.
However, the correlations between actual
yearling weight and yearling EPD was moderate
for Angus. Differences in actual yearling
weight were 2.80 and 1.71 pounds (for Angus
and Simmental, respectively) for each pound of
difference in yearling weight EPD, which is
close to the 2.0 pound difference expected.
Thus, although the relationship between EPDs
and average daily gain on test was not strong,
EPDs did a good job of predicting differences
in weight at a standardized age.
