Genomics

Ordering Kits:  Test kits can be ordered by contacting the office.

EPDs are selection tools that describe the genetic potential or breeding value of seed stock animals. EPDs are calculated using pedigree and performance data that is collected and submitted by members of the Canadian Angus Performance Program. These selection tools are used around the world to estimate how an animal’s calves will perform in comparison to either other animal’s calves or the breed average.

Traditionally, EPDs have been calculated using pedigree and performance information.

The more information that can be included in the calculation of EPDs, the more accurate or reliable the prediction of genetic breeding value will be. Accuracies are always posted with every EPD. P accuracies indicate parental averages. These are a good base line but have the lowest accuracy. P+ accuracies indicate Interim EPDs (Parental Averages plus a small amount of individual performance data). More accurate are national EPDs that have numerical accuracies (1 being the lowest and 100 being the most accurate).

Genomically Enhanced EPDs (GE-EPDs) can have higher accuracies for young animals and animals with limited performance data.

The table below indicates the increase in accuracy you can expect from the genomic marker panel available through the Canadian Angus Association. 

Trait Correlation (% Genetic Variance) Progeny Equivalents
SC .77 (59) 13
HP .49 (24) 12
CED .63 (40) 22
BW .66 (44) 12
Milk .38 (14) 15
Doc .65 (42) 9
WW .56 (31) 19
YW .67 (45) 23
DMI (RADG) .73 (53) 17
YH .73 (53) 10
MW .71 (50) 14
CW .58 (34) 7
Marb .66 (44) 17
RE .68 (46) 11
Fat .64 (41) 16

These improvements in accuracy are only seen in EPDs with low accuracies. Once an animal has progeny on the ground, and are proven, they have higher accuracy EPDs and the genomic marker panels have less impact on the accuracy of their EPDs. The graph below quantifies the amount of increase in accuracy that can be expected from genomic marker panels for traits that are 40% heritable. Most economically relevant traits in the beef have heritability of 40% or less.

(Spangler, 2011)

Reporting and Traits: Results from all three panels will be incorporated directly into our genomic evaluation for more accurate EPDs. In addition, the Association will make available percentile rank scores. Below are the traits and the percentile rank information that members will receive.

Trait Score 1 – 100
Calving Ease Direct 1 = more unassisted
Calving Ease Maternal 1 = more unassisted
Birth Weight 1 = lighter
Weaning Weight 1 = heavier
Yearling Weight 1 = heavier
Average Daily Gain (Post Weaning) 1 = heavier
Milk 1 = more milk
Marbling 1 = more marbled
Rib Eye Area 1 = bigger
Fat 1 = less back fat
Carcass Weight 1 = heavier carcass
Dry Matter Feed Intake 1 = eats less
Residual Feed Intake 1 = lower feed / lb
Tenderness 1 = more tender
Docility 1 = more docile
Yearling Height 1 = more hip height
Scrotal Circumference 1 = larger
Mature Weight 1 = heavier
Mature Height 1 = more height
Heifer Pregnancy n/a

 

 

 

Canadian Angus Association

292140 Wagon Wheel Blvd,
Rocky View County, AB T4A 0E2

Tel: (403) 571-3580
Fax: (403) 571-3599
Toll Free: 1-888-571-3580
E-Mail: cdnangus@cdnangus.ca
Text Line: 587-439-3440*
*Please note: this is an incoming text line only.  Responses will not be given from the same text line.

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Vision: The Canadian Angus Association exists to preserve and expand the Angus breed for Canadian cattle producers and beef consumers, providing the best opportunities for profitability today and for future generations. Mission: To maintain breed registry, breed purity and provide services that enhance the growth and position of the Angus breed.
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