The genetic guide to healthier cows

Industry buzz has been booming about new genetic programs that promise to create healthier cows.

That means it’s the perfect time to revisit the impact that selection for Productive Life within your genetic plan can have on the overall health and longevity of your cows.

 

The Productive Life (PL) number that appears for any given sire on your proof sheet is defined as the number of months longer (or shorter) that his daughters will be productive in your herd as compared to herdmates. If a bull is 7.0 for PL, his daughters within a given herd are predicted to live seven months longer than the average cow in that herd. If a bull is -2.0 for PL, his daughters are predicted to live about two months less than the average cow in that given herd.

PL is often associated with old cows. However, if you think about which cows live longest in your herd, it would be those that have no troubles calving, fewer incidences of mastitis, no respiratory issues, fewer hoof problems, and so on.

Four-event cows

In reality, genetic selection for PL doesn’t just mean more old cows; it predicts which cows are toughest, healthiest and easiest to manage. We call those the four-event cows. If you look at a cow card on your herd management software program, a four-event cow has only four events listed throughout her lactation: 1-fresh; 2-bred; 3-confirmed pregnant; and 4-dry.

If those four events are the only major things a cow experiences throughout her lactation, chances are she’s trouble-free, making you money, and will stick around for several lactations.

Any time an event takes place, such as milk fever, a displaced abomasum, retained placenta, mastitis, pneumonia, or any other disruption to the normal progression of a cow’s lactation, milk is lost. In addition to lost milk production, vet and treatment costs add to the dollars lost.

The proof is in the numbers

Selection for Productive Life propels you toward the goal of a herd full of four-event cows. Since the actual measure of PL is not calculated until after a cow leaves the herd, we can use other ways to see if higher PL bulls actually create healthier and more trouble-free cows.

Productive Life Table Chart

Table 1 breaks down the events within a real 2,400-cow Holstein herd on all first lactation animals with known sire ID’s. Based only on the animal’s parent average or Productive Life, this shows the extreme difference in health events between cows with a high PL pedigree versus those with a low PL pedigree

These are real numbers, recorded on this farm’s herd management software program. Keep in mind, management is consistent throughout the herd, and no preferential treatment is provided for any given cows.

As the table clearly illustrates, far fewer of the high PL cows had issues after calving and throughout their lactation. Fewer cows from high PL group were coded as ‘do not breeds’ (DNB) and therefore, fewer of the high PL cows died or were sold. This means more cows from within that high PL group claimed the title of trouble-free, four-event cows.

On your dairy, how much does a displaced abomasum decrease a cow’s profitability over her lactation? How much of your milk check is sacrificed with every case of mastitis? How many dollars are lost for every lame cow or case of pneumonia? If you put a dollar value to the lost production and treatment cost associated with each extra health event experienced by the group of low PL cows it adds up significantly.

Want healthier cows? Let Productive Life get you there

While environment, cow comfort and overall management practices all play an integral role in the health of any given herd, genetic selection can also aid your quest for a herd of healthy, trouble-free cows. To do that, keep these points in mind.

  1. Genetic selection for PL will help you create longer living cows.
  2. Despite new genetic programs promising added immunity or greater health during a cow’s transition period, PL remains the standard for breeding tougher, healthier cows with fewer issues throughout their lactations.
  3. Include selection for PL as part of your customized genetic plan in order to build your herd of the profitable, four-event cows.
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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 new information. Here we have answers to 14 questions to help you decide what’s best for your dairy to make the maximum genetic progress in the direction of your goals!

What is Dairy Wellness Profit $ (DWP$) and 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.

How is Dairy Wellness Profit $ (DWP$) compiled?

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

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

Are the Wellness traits developed by Zoetis?

The WT$ calculation is not a new concept, as it was first published in 2004, however this is the first routine evaluation and first genomic prediction for those traits.

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

No, but we tested the sires that we predicted would do well on the respective indexes based on their health trait values and how they rank on a 34% Production-56% Health-10% Conformation index. We are listing the top ten DWP$ sires and top five WT$ bulls in each of three categories: G-Stars, FutureStars 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 34-56-10 index is very high, we can predict quite well which sires will rank well on the DWP$ index.

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Alta Genetics Bull Search app now available!

Bull Search App Banner

Alta Genetics Bull Search app now available!
Genetic planning for your herd is now simpler than ever with the all new Alta Bull Search app for iPhone.

In addition to Alta’s comprehensive online Bull Search, iPhone users now have the added functionality to search for the right bulls to meet their goals using the Alta Genetics Bull Search app.
The brand new app allows you to find rankings for sires that best fit your genetic plan and to see individual sire proofs on Alta bulls and all active industry sires with a TPI greater than 1700. Once the app is downloaded, internet connectivity is not needed to browse.
At Alta, we prefer not to rate bulls only on single traits or industry standard indexes. Our goal is to create value with your end result in mind – a productive and profitable herd. Since we know that standard genetic indexes do not match everyone’s goals, we took the industry lead to work with a variety of customized breeding goals and genetic plans.
We hope you enjoy the first release of the iOS version of the Alta Genetics Bull Search app. Coming soon will be an Android version of the app, as well as new and more proof information and additional functionality to both app versions.
Please click here to download the all new Alta Genetics Bull Search app to your iPhone.

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