December Sire Summary Changes

The Darling Hotel
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Several new changes have accompanied this sire summary. The Holstein, Jersey and Brown Swiss breeds all saw significant modifications to their data.

CDCB Releases New Feed Saved Trait

Feed is the single highest expense on your farm, and therefore breeding for feed efficiency improvement can benefit your bottom line. In addition to lower feed costs, a more feed efficient herd is more sustainable with less manure and greenhouse gas impacts on the environment.

Overall, you want your cows of the future to have high milk yield, low maintenance costs and a high proportion of energy per unit of feed consumed. The release of CDCB’s highly anticipated Feed Saved (FSAV) is progress in creating that more efficient cow. FSAV includes collaborative data and is based on multiple years of research. In simple terms, FSAV represents the expected pounds of feed saved per lactation based on Body Weight Composite and Residual Feed Intake evaluations. Larger, positive values are more favorable.

How do I read the FSAV trait values?

Trait Bull A Bull B
Feed Saved
+200
-300

Given the same production and body size, daughters of Bull A will eat 500 less pounds of feed per lactation than daughters of Bull B.

What are the ranges and reliabilities for FSAV?

Mean (Average) Minimum Maximum
FS PTA
-116
-822
633
FS Rel
37
0
89

How should I select for feed efficiency?

We recommend genetic selection based on an index to ensure collective progress over time for a balance of traits. FSAV will be incorporated into ICC in the April 2021 proofs. It is anticipated FSAV will be added into Lifetime Net Merit at that time as well.

For a more in-depth look at FSAV, view the CDCB trait reference sheet.

Heifer Livability Available for Holsteins and Jerseys

Another new trait release with the December 2020 sire summary is Heifer Livability. This trait, available for both the Holstein and Jersey breeds, is described as: The expected livability percentage of a bull’s female offspring from 2 days after birth up to 18 months of age in a herd with average management conditions. Larger, positive values being more favorable.

For further details on Heifer Livability, click here.

Brown Swiss PPR Index Updated

With the December proofs, the Brown Swiss PPR index formula has been updated. Some of the changes include lowering the Fat and Protein ratios, increasing the Daughter Pregnancy Rate (DPR) and Productive Life (PL) ratios, and adding SCS back into the formula. The following table shows the changes in comparison to the previous formula.

PRO FAT SCS PL UDC MOBILITY DPR COW LIV
2017
34
28
0
6
10
6
12
4
December 2020
30
22
4
8
10
6
16
4

Undesirable Genetic Factor Identified in Jerseys

The American Jersey Cattle Association has identified a new undesirable genetic factor in the Jersey breed, called Neuropathy with Splayed Forelimbs (JNS). Calves affected with JNS are unable to stand on splayed forelimbs that exhibit significant extensor rigidity and/or excessive lateral abduction at birth.

Less than 6% of the genotyped Jersey population are carriers of the haplotype, and no bulls in the GENEX active lineup are identified as carriers at this time. For more information, click here.

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