BASE CHANGE AND TPI FORMULA ADJUSTMENTS

BASE CHANGE AND TPI FORMULA ADJUSTMENTS

Base change and TPI formula adjustments December proofs 2014

During the December genetic evaluations this year the Holstein Association USA will effectuate the quinquennial base change. The new base will be determined by cows born in 2010, resulting in updated proofs. Also two new components will be added to the TPI formula: feed efficiency and the new fertility index. Furthermore the production traits (pounds fat & pounds protein) will get more weight, so from 43% to 46%. The type part will go from 29% to 26%, while the health traits will maintain at 28% in the new TPI formula.

As a result of these changes the (genomic) proofs of individual animals can modify, even without changes in daughter- or DNA information. So the August proofs are not completely comparable to the new December proofs.

Click here for the Holstein Association webinar video December base change

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