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.
Average Black EPDs for all Calves born in 2016
Average Red EPDs for all Calves born in 2016
|Birth Weight||Weaning Weight||Yearling Weight||Milk||Total Maternal||Scrotal Circ.||Calving Ease Direct||Calving Ease Mat.||Stay||HPG||Marbling||REA||Fat||Yield Grade||Carcass Wt|
|EPD||+2.1 –0.4||+45 +53||+80 +78||+21 +17||+43 +44||+1.23 n/a||+3.5 +3.4||+6.6 +4.0||n/a +10||n/a +10||+0.77 +0.29||+0.69 +0.05||+0.015 -0.013||n/a
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).
In order to accurately select young animals or animals with very little individual or progeny performance information available, the industry has developed genomic marker panels. The Zoetis HD 50K and i50K Red Angus and Black Angus genomic marker panels are available to Canadian Angus Association members. These genomic marker panels are used to increase the accuracies for EPDs on animals with little performance data (typically young animals but also animals belonging to non-performance data herds).
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 panels available through the Canadian Angus Association. Each panel explains a different amount of variation for each trait. The best panel will depend on which traits are most important to each member. The Zoetis 50K HD Red and Black Angus panels include parentage verification.
|Correlation (% Genetic Variance)||Progeny Equivalents||Correlation (% Genetic Variance)||Progeny Equivalents|
|CED||.63 (40)||22||.73 (53)||22|
|BW||.66 (44)||12||.72 (52)||13|
|Milk||.38 (14)||15||.49 (24)||15|
|WW||.56 (31)||19||.56 (31)||13|
|YW||.67 (45)||23||.62 (38)||15|
|DMI (RADG)||.73 (53)||17|
|Marb||.66 (44)||17||.57 (32)||10|
|RE||.68 (46)||11||.57 (32)||8|
|Fat||.64 (41)||16||.73 (53)||26|
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.
Reporting and Traits: Results from all three panels will be incorporated directly into our two genomic evaluations for more accurate EPDs. In addition, the Association will make available Zoetis percentile rank scores. Below are the traits and the percentile rank information that members will receive.
|Trait||Zoetis 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|