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About: Tara Bohnert

Recent Posts by Tara Bohnert

What’s new with Jersey genetic evaluations?

With April proofs, CDCB implemented a few changes to the Jersey genetic model used to calculate proof figures – this includes updates to Jersey genetic calculations.

These changes adjust for previous inflation, and should result in more stable and accurate evaluations.

What does that mean for you? Here, we break it down.

UPDATE 1: PRODUCTIVE LIFE MODEL

CDCB adjusted the model for Productive Life. This causes a variable rollback of not only PL, but also DPR and NM$. And since PL is 6% of the JPI formula, the Jersey genetic values for JPI will be lower for most bulls as compared to December. In addition, Cheese Merit $ will also decrease.

This is not a base change. It is simply an adjustment to the model to account for previous PL values that were slightly inflated.

The highest ranking Jersey sires saw the most extreme changes. But overall, here are the average drops across all industry bulls:

  • Industry genomic Jersey bulls: ↓ 2.0 PL |  ↓ 0.8 DPR  |  ↓ 56NM$
  • Industry daughter-proven Jersey sires: ↓ 1.0 PL |  ↓ 0.7 DPR  |  ↓ 26 NM$

 

UPDATE 2: THE ALL-BREED SYSTEM EXTENDS TO GENOMIC EVALUATIONS

Genomic evaluations are now evaluated on an all-breed base first, and then converted to within-breed genetic bases.

This much anticipated update should have little, if any, impact on purebred (HR) Jerseys. This update meant that JX animals and those with generation counts in their pedigree dropped, on average, about 20 points more than their purebred counterparts.

This is NOT a crossbred evaluation. Animals not meeting the requirements of the AJCA will still not receive an evaluation.

 

If you have any questions on these changes or on Alta Jerseys, contact Tara Bohnert, Alta’s Jersey Marketing Manager.

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Introducing JPI 2017

With April proofs comes the introduction of JPI 2017 to replace the previous JPI 2015.

Jersey Performance Index™ (JPI™) is the American Jersey Cattle Association’s (AJCA) strategy for increasing lifetime net income.

The AJCA took into account the following three key fundamentals for Jersey sustainability while determining JPI 2017. These fundamentals were determined by a Capper and Cady 2012 study comparing the environmental impact of Jersey and Holstein milk for cheese production.

  • Increase production
  • Maintain body size
  • Maintain or improve components

What is the purpose of the new JPI 2017?

  • Increase milk production
  • Improve the density of milk
  • Moderate body weight
  • Improve herd life, fertility, udder health, and functional conformation

What new traits have been added to the formula? 

  • CFP Milk
    • Every 100 pounds of PTA milk needs 8.8 pounds combined fat and protein
    • Pounds of Milk = CFP/0.088
    • CFP Milk = PTA Milk – Pounds of Milk
    • If CFP Milk is positive, the JPI™ value is negative because there is more water than components
  • Body Weight Composite (BWC)
    • Proxy for feed efficiency, and replaces body size composite
  • PTA Cow Livability
    • Measures a cow’s ability to stay alive on the farm

What is the impact of JPI 2017? 
  • Significant drops in JPI for all industry sires.
    • The upper JPI threshold will drop from about 300 JPI to 230 JPI, and all industry bulls will drop in their JPI value.
  • Significant rescaling, similar to a base change.
    • We see genomic sires JPI™ values fall 38 points on average
  • Some re-ranking – in both directions
    • Some minor and some significant

Here is a full breakdown of the new JPI 2017. In the simplest terms, JPI 2017 has five percent less weight on production and five percent more weight on type traits as compared to JPI 2015. But there’s more to it than that. The following traits are new additions to the JPI 2017 formula.

Image comparing the genetic index weights on production, health and type traits for JPI 2015 versus JPI 2017

JPI 2015JPI 2017
Protein4330
Fat1515
CFP Milk-8
PRODUCTION TOTAL WEIGHT5853
Productive life106
Cow livability-4
Somatic cell score66
Daughter pregnancy rate77
Cow conception rate22
Heifer conception rate22
HEALTH TOTAL WEIGHT2727
Stature-0.6-0.9
Strength-0.1-3.4
Dairy form2.0
Rump angle-0.1
Rump width0.2-0.7
Rear Legs -0.1-0.1
Foot angle0.10.1
Fore udder2.62.4
Rear udder height1.91.8
Rear udder width0.10.1
Udder cleft2.11.9
Udder depth5.14.7
Teat placement1.00.9
Teat length-1.0-0.9
TYPE TOTAL WEIGHT1520
No time is better than now to sit down and review your genetic plan and strategy. When you set your own unique herd index, you will maximize genetic gains in the areas that most impact your farm’s profitability.
Focus on your goals and work with your trusted Alta advisor to create a customized index as an investment in your future.
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