DOWN UNDER GENETICS RANKING ANALYSIS
We at Down Under Genetics have analyzed the information presented and have put together
a ranking analysis that while not scientifically defensible will, we believe give the casual observer
an idea of the relative value of different animals. This system merely takes the ranges of the
measured traits and grades them from bottom to top. The bottom that is the least desirable side
of the equation, whether a minus or a plus, is expressed as a zero and the top as a hundred. The
resulting number is then multiplied by the % reliability for that trait as supplied by Pfizer. This is
called the Trait Summary Number. A TSN tells you the grading point on a scale of one to 100 of
the trait being evaluated multiplied by the reliability of the number.
For instance the Feed Efficiency Range is from –3.17 to 2.38, that’s a total of 5.55 lbs. Changing
that scale from 5.55 to one hundred would mean that .18 would multiply each hundredth of a point.
The bottom number (0) would translate to a positive 2.38 pounds and the top (100) would translate
to a –3.17 pounds. A bit more math is involved but this is a fairly good summary of the resulting
Trait Summary Number.
A reading of 0.0 would translate to 238 X .18= 43 X 30% = 13.
Looking at Marbling we have a range or 2.11. Then each one hundreth of a point is worth .47
on a scale of one to one hundred. On this marker positive is better so the bottom number or zero
here corresponds to –1.00, and the top or 100 to 1.11. Let’s take a score of 0. That would
translate to 47 on our one to one hundred scale and then with the reliability of 26% we’d
end up with a Trait Summary Number of 12
On Tenderness we have a range of 2.93 and on this is minus is positive. A max force of 1.89
pounds would translate to ) on our scale of zero to one hundred, and a top score of –1.04 would
translate to one hundred. Each one hundredth would then have a value of .34 on the zero to
one hundred scale. Again let’s go with an initial reading of zero this would translate to
189 X .34 =63 X our % reliability of 49% = 31
Taking the above animal it would have the following readings:
Feed efficiency 13
Marbling 12
Tenderness 31
All are of course relative to other numbers in their class and all have been corrected for reliability.
We believe our Trait Summary Number is a real working tool that can be easily applied and
understood. For a more complete understanding and analysis refer to the Pfizer Summary,
but for a quick look the Down Under Trait Summary is a useful tool.
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