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What you need to know about the April 2020 US Genetic Base Change

A genetic base change is an adjustment of predicted transmitting abilities (PTAs) for all animals in a given breed. This change resets the average PTAs for each trait within a new reference population back to zero.

With the April 2020 US genetic base change in mind, here are five key points to remember.

1. THE BASE CHANGE HAPPENS EVERY 5 YEARS.

It happens this frequently to ensure that the values for traits and indexes don’t grow to unrealistically high levels. The last base change took place in December 2014, and the next one will be in 2025.

2. THIS BASE CHANGE ACCOUNTS FOR THE AMOUNT OF GENETIC PROGRESS WE’VE MADE SINCE THE LAST BASE CHANGE.

Dairy cattle genetics are continually improving, and the base change is the way to quantify the actual amount of progress that we’ve made for each trait within each breed.

For example, the base change for PTA Milk in the Holstein breed is 492. That means that the average genetic level for pounds of milk in the Holstein breed has increased by 492 pounds over the past five years. To account for this progress, the PTA Milk value for all Holsteins will automatically decrease by 492 pounds with April 2020 proofs.

3. THE NEW REFERENCE POPULATION WAS BORN IN 2015.

The base change means resetting the average PTAs for the reference population to zero. The previous reference population was made up of the sire-identified animals born in 2010. Since the new reference population is animals born in 2015, that means this current base change will now set the average PTA of cows born in 2015 back to zero.

4. DOWNWARD ADJUSTMENTS ARE ACTUALLY A GOOD THING!

In general, a downward adjustment for a trait is the amount of genetic progress we’ve made for that trait. So a larger downward adjustment is actually a good thing – it just means we’ve made that much more genetic progress for that given trait!

Because of the downward adjustments, we’ll need to get used to new, generally lower reference levels for the traits and indexes that we affect our genetic selection decisions.

5. THE BASE CHANGE DOES NOT AFFECT THE RELATIVE RANK OF ANIMALS.

Even though the base change will cause PTA values for bulls and cows to appear lower for most traits, it is the same adjustment for all animals. That means individual rankings will not be impacted.

WHAT ARE THE ACTUAL CHANGES?

Wondering what the actual changes will be? Table 1 below lays it all out.

Because a positive value is the amount of progress we’ve made, it also means the PTA for that trait will decrease by this amount. Conversely, negative values mean the PTA for that trait will actually increase by that amount.

To clearly assess the overall picture of genetic progress, trait changes shown in black show positive progress. Traits shown in red have made negative progress over the past five years.

*Please note that the CDCB will recalculate these values with April 2020 proofs using more complete and current data. So there may be slight changes between now and then.*

Table 1. PTA difference of cows born in 2015 compared to those born in 2010. PTAs will decrease by these amounts in April 2020.

TRAITUNITSHOLSTEINJERSEYBROWN SWISS
MilkPounds492524214
FatPounds24258
ProteinPounds18208
Productive life | PLMonths1.861.540.24
Daughter pregnancy rate | DPR%0.24-0.99-0.62
Somatic cell score | SCSLog base 2 units-0.0800
Heifer conception rate | HCR%0.50.44-0.24
Cow conception rate |CCR%0.38-0.9-0.74
Cow livability | LIV%0.740.08-0.28
Displaced abomasum | DA%0.21--
Ketosis | KET%0.2--
Mastitis | MAST%0.6--
Metritis | MET%0.34--
Milk fever | MFEV%-0.06--
Retained Placenta | RP%0.05--
Early first calving | EFCDays1.51.40.5
Gestation length | GLDays-0.350.3-0.03
Sire Calving Ease | SCE%-0.4--0.3
Daughter Calving Ease | DCE%-1.9--0.6
Sire Stillbirth | SSB%-0.3--
Daughter Stillbirth | DSB%-1.6--
Final Score (PTAT)Points0.760.70.4
Udder composite | UDC / JUI0.85--
Feet and leg composite | FLC0.49--
Lifetime Net Merit | NM$Dollars23119160
Lifetime Cheese Merit | CM$Dollars23919663
Lifetime Fluid Merit | FM$Dollars21917956
Lifetime Grazing Merit | GM$Dollars20714238
StaturePoints0.470.50.6
StrengthPoints0.200.2
Dairy formPoints0.380.40.3
Foot anglePoints0.50.10.1
Feet and leg score0.54
Rear legs - side viewPoints-0.0200.1
Rear legs - rear view0.49
Body depth0.14
Rump anglePoints-0.020.40
Rump widthPoints0.360.10.1
Fore udder attachmentPoints1.010.70.3
Rear udder heightPoints1.20.60.3
Rear udder widthPoints1.160.20.3
Udder depthPoints0.840.90.2
Udder cleftPoints0.540.10.1
Front teat placementPoints0.520.30.3
Rear teat placement0.49
Teat lengthPoints-0.270-0.2
Body weight composite0.15

HOW DOES THIS COMPARE?

Are you curious how the amount of progress over the past five years compares to the progress we made before that? The tables below lay it all out for the Holstein and Jersey breeds.

HOLSTEIN BASE CHANGE COMPARISONMilkFatProtPLDPRNM$
2020 CHANGES (progress made from 2015-2020)49224181.9 0.24231
2015 CHANGES (progress made from 2010-2015)38217121.00.2184
JERSEY BASE CHANGE COMPARISONMilkFatProtPLDPRSCSNM$
2020 Changes (progress made from 2015-2020)52425201.54-0.990.00191
2015 Changes (progress made from 2010-2015)38219120.80.00.04124

You’ll see that for the production traits, both Holsteins and Jerseys made significantly more progress in the past five years, than in the five years preceding. That means, as an industry, we’re making huge strides. Have confidence that the bulls you use now will deliver profitable results through their offspring.

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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.

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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Daughter-proven options to fit your genetic plan

When it comes to sire proofs, is high reliability part of your genetic plan? If so, select from several different sire options atop our daughter-proven lineup that are either new to the proven ranks or have just added new daughter information.

These bulls offer a wide range of trait specialties to fit many different customized genetic plans.

11HO11478 AltaLEAF | AltaOAK X TRIGGER X PLANET | CP | 2689 TPI

  • Perfect balance of production, health, fertility and type
  • Improved on pounds of milk and fat, PL, DPR and type with new daughters added
  • Moderate sized cows with wide rumps, and excellent udders
  • #8 daughter-proven TPI sire in the industry

11HO11437 AltaSPRING | MOGUL X GERARD X MASCOL | 2563 TPI

  • Now over 3.00 for UDC – outstanding, high, wide rear udders and strong fore udder attachments
  • Moderate-sized cows with great balance of dairyness and strength
  • International producer favorite!

11HO11337 AltaCAIN | MAUI X INDIANA X LEVI | CP | 2560 TPI

  • Fat yield improver and low somatic cell score
  • High fertility Concept Plus status paired with excellent daughter fertility traits
  • Outcross sire with functional conformation traits on moderate sized cows

11HO11380 AltaROBLE | MOGUL X OBSERVER X SHOTTLE | CP| 511 | 2557 TPI

  • Health and type trait specialist
  • A high fertility Concept Plus sire that’s also at an elite 4.1 DPR!
  • Stylish, high type daughters with outstanding udders (+3.11 UDC)

11HO11419 AltaLEGAL | MOGUL X PLANET X LYNCH | CP | 511 | 2525 TPI

  • Production specialist
  • Great milk yield and outstanding components
  • Functional type traits, with excellent height and width of rear udders

11HO11379 AltaRABO | MOGUL X OBSERER X SHOTTLE | CP | 2520 TPI

  • Medium-sized cows with great dairyness
  • Type, udder and foot & leg improver
  • A high fertility sire with low calving ease

11HO1422 AltaJAKE | PETRONE X OBSERVER X GOLDWYN | CP | 511 | 2520 TPI

  • Health trait specialist at 8.2 PL
  • Fertility leader at 5.2 DPR and with the coveted Concept Plus high fertility sire status
  • Moderate stature, youthful cows with great dairyness

11HO11493 AltaHOTROD | JEROD X AltaIOTA X GOLDWYN | CP | 2483 TPI

  • New graduate from Future Star status – with high sire fertility and low calving ease
  • Tall, long, stylish cows
  • Youthful, well-attached udders – protect for short teats
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