Home Ask the ExpertBreeding and GeneticsDo the current indexes have enough weight on production traits?
 

Do the current indexes have enough weight on production traits?

 
Alta Genetics
June 7th 2011

It seems very few high PTAM bulls rank high on the lists!

 
Bartele Verbeek
Netherlands

The weight on production in TPI and NM$ is respectively 42% and 35%


June 22nd 2011
In national indexes like TPI and Net Merit, milk gets no direct emphasis. The weight for production is fully on pounds of Fat and Protein. With the high correlation between milk and CFP, it is obvious that high milk has a positive impact on the ranking of bulls, but since weight on production is only 42% in the TPI score and 35% in Net Merit, it means that high milk bulls not necessarily are found at the top.

If you want to check out the weightings of the national indexes then click on the following links:
For TPI : http://www.holsteinusa.com/genetic_evaluations/ss_tpi_formula.html
For Net Merit: http://aipl.arsusda.gov/reference/nmcalc.htm

So if milk has a high value for the profitability of your dairy, you should re-rank the bulls according to your needs.
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