BREEDING AND GENETICS - American Society of Animal Science

340 Relationship between EPDs for Angus bulls evaluated
in the Angus National Cattle Evaluation and the
Simmental Multi-Breed International Cattle Evaluation
systems. B. E. Cunningham* 1 , S. Schaeffer 2 , and M. Dong 2 ,
1 American Simmental Association, Bozeman, MT, 2 Cornell University,
Ithaca, NY.
In the ASA’s Multi-Breed International Cattle Evaluation (MB-ICE)
system, sires are evaluated together regardless of genotype. There were
107 Angus bulls in the MB-ICE system that were published in the Fall
1997 Angus Sire Evaluation Report. The average accuracies for the Angus
EPDs were .98, .97, .96, and .93 for Birth Weight (BWT), Weaning
Weight (WWT), Yearling Weight (YWT), and Maternal Milk (MMK).
The average-BIF accuracies for the ASA EPDs were .38, .35, .35, and
.30 for BWT, WWT, YWT, and MMK. The BIF accuracies were converted
to r ti. Individual expected correlations (E(r)) were calculated
as the product of the Angus and ASA r tis. Sires were grouped into
three groups based on individual E(r): High (> .75); Medium (.50–.74);
and Low (< .50). Simple and rank correlations were calculated using
the bulls’ ASA and Angus EPDs. The results indicate the ASA sire
rankings should move closer to the Angus sire rankings with additional
progeny and daughter records.
Trait Group n r 1 pm r2 rank
BWT High 47 .60 .60
Medium 52 .40 .42
Low 8 .10 .23
WWT High 41 .71 .71
Medium 55 .39 .35
Low 11 −.13 .00
YWT High 41 .68 .59
Medium 54 .37 .32
Low 11 .00 .24
MMK High 33 .59 .52
Medium 54 .38 .33
Low 20 .30 .44
1 Rank Correlation
2 Product-Moment Correlation
Key Words: Expected Progeny Difference, Beef Cattle, Genetic Evaluation
J. Anim. Sci. Vol. 76, Suppl. 1/J. Dairy Sci. Vol. 81, Suppl. 1/1998 87