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.