American Angus Association®Genetic Condition Update
Developmental Duplication (08/12/13)
A genetic condition has been identified and documented in Angus cattle from research initiated
in Australia with Dr. Jon Beever at the University of Illinois. This condition, inherited as a
simple recessive, has been designated as Developmental Duplication (DD).
The A.I. organizations requested that the American Angus Association provide to the
membership the identity of and preliminary test results for those 1,099 Angus bulls tested by Dr.
Jon Beever of the University of Illinois to determine whether they were carriers or free of the
mutation identified for this genetic condition.
The Association Board of Director’s decision to provide that information to the membership is
based in part on its understanding that the test used here was run on a set of animals requested by
Dr. Beever from the A.I. organizations for research purposes and therefore remains preliminary
Earlier this afternoon, the Board of Directors convened by phone to consider the implications of
this genetic condition. At the conclusion of that meeting, President Trowbridge appointed a Task
Force and directed it to report to the full Board as soon as practicable on how the Association
should respond to this condition. In fulfilling that charge, the Task Force was asked to consider
the best interests of the breed and the membership, the evolving scientific advances in the field
of genetics, our membership’s ability to manage such conditions and the likelihood that the
scientific community will continue to identify additional genetic conditions in all breeds in the
We will keep you advised on the Board's approach as it occurs.
For an update on the research by Dr. Beever, the list of the animals and their preliminary test
results, please click here:http://www.angus.org/Pub/DD/DD_Update08122013.pdf
This is the defect where the majority of calves carried to term and born exhibiting this trait are born with additional limbs, usually duplication of the front legs and originating from the neck or shoulder region.
The report says that they believe the evidence suggests that most homozygous carriers of the defect are not carried to term, meaning very few are observed at birth. They estimate a carrier frequency of about 6% among US sires.
B/R New Design 036 is a carrier, as well as at least three of his most well known sons. Bon View New design 036, GAR Predestined, and GAR New Design 5050. Ken Caryl Mr Angus 8017 Reg# 8989216 born in 1977, is the oldest reported carrier. That name appears back in many pedigrees. He is the Grand Sire of the Great Grandmother of 036.
Rito 2v1, Sitz N D 458n, B/R New Day 454, Bon View New Design 1407 are also carriers...