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4 things to know about the new TPI formula update

With April 2020 genetic evaluations comes a newly updated TPI formula. While the changes are not major, it is important for you to stay aware of these updates, especially if TPI is your genetic plan of choice.

WHAT ARE THE KEY TPI UPDATES?

1. The fat to protein ratio is now equal

Previously, pounds of protein was weighted at 21% of the total index, while pounds of fat was weighted at 17%. Due to market conditions, these weights are now equal, at 19% each.

2. The CDCB health traits are now included in TPI

Within the health trait category of TPI, you’ll now see that the six CDCB health traits (resistance to mastitis, ketosis, retained placenta, metritis, displaced abomasum, and milk fever) are included. The Holstein Association has combined the six traits together into one economic index, which carries 2% of the total weight of the TPI formula.

This 2% weight essentially comes by removing 1% weight from Somatic Cell Score and 1% weight from Daughter Calving Ease. This makes sense, since the six health traits account both for resistance to mastitis, and other metabolic diseases that typically occur around calving.

3. Foot & Leg Composite (FLC) now includes emphasis on Rear Legs Side View

The Holstein breed has been trending toward a more posty, or straight, set to the rear legs. To help correct this two-way trait, Rear Legs Side View will now be included as part of the foot & leg composite index.

4. There will be 1% less weight on conformation, and 1% more weight on health

Because creating healthy, trouble-free cows is a goal that all producers share, Holstein USA has decided to move 1% weight away from Dairy Form in the conformation category of TPI, and shift that weight to Productive Life, within the Health category. With that shift, the new category weights of TPI are shown here.

Category weights of TPI 2020 versus TPI 2017

Additional updates that the Holstein Association USA is making to the TPI formula are as follows:

  • The fertility index now includes the trait Early First Calving
  • The standard deviations for traits are updated

 

So if TPI is your genetic plan of choice, be sure you know what’s included so you ensure you continue making genetic progress in the direction of your unique goals.

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A Q&A on DWP$ and WT$ – Dairy Wellness Profit $ / Wellness Trait $

Dairy Wellness Profit $ and Wellness Trait $ indexes

The Dairy Wellness Profit $ and Wellness Trait $ indexes may have you wondering whether you should adjust your genetic plan to include this information. We want to help you decide what’s best for your dairy. So we answer a few questions about DWP$ and WT$ to help you better understand these indexes.

What is Dairy Wellness Profit $ (DWP$)?

Dairy Wellness Profit $ (DWP$) is a genetic selection index. It equates to a genetic plan of 34% production–56% health–10% conformation. This differs from TPI (46-28-26) and the overall NM$ index (43-41-16).

The breakdown of the weight on health is different as well. DWP$ puts 30% of the health trait weight on WT$. This leaves 26% for the CDCB evaluated health traits of PL, DPR, SCS, DSB, DCE, CCR, HCR.

What is Wellness Trait $ (WT$?)

WT$ is a combination of the Wellness Traits (ketosis, displaced abomasum, retained placenta, metritis, mastitis and lameness). This means it is an index analogous to a 0-100-0 index, with 100% weight on health traits. However, those weights are divided between the various Wellness traits that Zoetis calculates.

Do each of the Wellness Traits get their own evaluation?

Yes. They are then combined into a Wellness Trait $ index to combine the expected impact.

Does Alta test all bulls for DWP$ and WT$?

No, but we test the sires that we predict will do well on the respective indexes. We test our bulls that have favorable health trait values and rank well on a 34% Production-56% Health-10% Conformation index. We list the top ten DWP$ sires and top five WT$ bulls in each of three categories: G-STARS, FUTURE STARS and daughter-proven sires.

What is Alta’s testing plan going forward?

This will be dependent on the feedback from the customers and the demand for this information. In the short-term we will continue to test those sires that rank well on a traditional 34-56-10 index.

How can we predict which sires will do well on these indexes?

Because the correlation between DWP$ and a traditional 34% production – 56% health – 10% conformation index is very high, we can predict quite well which sires will rank well on the DWP$ index.

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