Here is the information from the Association
This is for Registry as a Shorthorn plus
SHORTHORNPLUS REGISTRY: ShorthornPlus registration shall extend to and be
available for all Shorthorn animals (less than 15/16 in blood concentration) provided:
1. Eligibility: Initial entries into the ShorthornPlus Registry Program shall receive the
prefix AR prior to registration number. This prefix shall be assigned to all cattle of
the following percentages: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, and
7/8, except that cattle with black markings or coat color cannot exceed the 1/2
percentage designation.
2. Blood Concentration Levels: The following rules shall govern the determination of
the blood concentration levels:
a. Fractional Levels Used: A denominator of one-sixteenth shall be the smallest
fraction used in identifying percentage of Shorthorn blood concentration level
on the certificate of registry. 4
b. Smaller Fractional Levels: Animals falling in between the sixteenth
denominator in actual Shorthorn blood concentration shall be recorded at the
direction of the Blood Determination Chart.
This is for showing as a Shorthorn Plus
Eligibility for Shows: ShorthornPlus and Durham Red animals are only
eligible to show at designated ShorthornPlus shows and are not eligible for
PACE points. Starting with the 2010/2011 show season, ShorthornPlus and
Durham Red animals are only eligible to show at designated ShorthornPlus
shows and are not eligible for PACE points. All ShorthornPlus animals must
be 50% Shorthorn blood concentration or higher (7/16 if dam or sire is purebred
15/16) to be eligible for ShorthornPlus shows.
It doesn't say anything about Appendix anymore