Upcoming Changes to CDCB Evaluation System - December 2022 - Cowsmo

Upcoming Changes to CDCB Evaluation System – December 2022

CDCB and USDA AGIL announce updates for the December 6, 2022, triannual evaluation.

International evaluations for clinical mastitis in Brown Swiss
By Rodrigo Mota and Kristen Gaddis
In September 2022, the Brown Swiss clinical mastitis traits (CMA; MAST) successfully completed validation at the Interbull level. Therefore, effective with the December 2022 evaluation, Brown Swiss foreign evaluations will be included in the U.S. Clinical Mastitis evaluations. The impact of this inclusion is expected to be limited, as only two other foreign countries (France and Switzerland) contribute to the CDCB Mastitis evaluation.

Including U.S.-only daughters and herds in Feed Saved
By Ezequiel L. Nicolazzi and Gary Fok
In the August 2022 evaluation, a procedure was implemented to (internally) improve the management of foreign evaluation. The new procedure had an unintended consequence of excluding information on Feed Saved herds and daughters in the format 38 (38alloff) for U.S.-only bulls. This small flaw is now resolved.

Correction to pedigree usage in non-Holstein type traditional evaluation
By Ezequiel L. Nicolazzi and Paul VanRaden
An incorrect sort order in the pedigree file used in the non-Holstein type traditional evaluation was detected and fixed in the December 2022 evaluation. No other trait groups or breeds are affected. The flaw determined a sub-optimal use of the pedigree, not allowing the model to use all the connections for non-Holstein animals. The largest impact, in terms of increase in reliability and changes in PTA, will be observed in pre-2000 bulls. For some individual post-2000 animals (both bulls and cows), variation will be observed. The impact on recent A.I. bulls was limited. Correlations in all traditional type evaluations for Jersey bulls were higher than 99.8% when compared to the official August 2022

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