Composite Index is the comparison of an individuals EPD's to the breed average. The breed average EPD in each trait is given a value of 20 points resulting in a composite index of 100%. Applying this formula to an individual's EPD's gives the composite index for that animal. The Polypay NSIP Breeders agreed upon this formula comparing sheep to the average rather than the extreme; it is not an NSIP formula. | | WW | PWW | MM | M&G | NB | Composite | | Breed Average | .8 | 2.0 | .5 | .9 | 3.7 | | | Trait Weight | 20 | 20 | 20 | 20 | 20 | =100 | | Sheep A | 2.0 | 5.5 | .0 | 1.0 | -.2 | 126% | | Sheep B | 1.0 | 2.5 | .8 | 1.3 | 8.2 | 155% | There is the option for individuals to change the weight on each trait in order to put emphasis on a desired trait - the weight must equal 100. | | WW | PWW | MM | M&G | NB | Composite | | Breed Average | .8 | 2.0 | .5 | .9 | 3.7 | | | Trait Weight | 10 | 10 | 25 | 35 | 20 | =100 | | Sheep A | 2.0 | 5.5 | .0 | 1.0 | -.2 | 90% | | Sheep B | 1.0 | 2.5 | .8 | 1.3 | 8.2 | 160% |
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