Validation and implementation of new genomic traits in The Netherlands: lactose, urea, calf survival, ketosis, conception rate, heifer fertility, and AMS traits.


  • Marianne Stoop CRV
  • Chris Schrooten CRV
  • Irma Vermeer CRV
  • Gerben de Jong CRV


genomics, validation, dairy cattle, novel traits


Since April 2015, the Dutch-Flemish evaluation has been publishing genomically enhanced breeding values (GEBV) for a total of 65 traits and indices. These include traditional traits like milk production, conformation, longevity and calving traits;  health traits like udder health, claw health, and fertlity traits; as well as novel traits that were recently introduced in the Dutch-Flemish (genomic) evaluation: lactose, urea, conception rate (to replace non-return 56), heifer fertility traits, calf survival, ketosis, and automatic milking system (AMS) traits.

In the Dutch-Flemish genomic evaluation system bulls are considered for the training population when their breeding value for the trait of interest exceeds 50 percent reliability. However, additional edits might be advisable when correlations between countries are low or for traits where the reliability is highly dependent on correlated traits, rather than true (daughter) observations.

Author Biographies

Marianne Stoop, CRV

Chris Schrooten, CRV

Irma Vermeer, CRV

Gerben de Jong, CRV