Full Crossbred Analysis Implemented for Blonde d’Aquitaine

Aug 2019

The BREEDPLAN analysis has several different ways in which performance data from crossbred animals can be
handled, with different breed societies implementing different analysis types. These are:

  1. Purebred analysis: No crossbreds are included. Only performance data from purebred animals is included in the BREEDPLAN analysis.
  2. Partial crossbred analysis: Crossbreds are included. Contemporary groups are sub-grouped so that head-to-head comparisons are restricted to animals of the same breed type only (e.g. animals of 50% breed content are subgrouped from animals of 100% breed content).
  3. Full crossbred analysis: Crossbreds are included. Animals of different breed type are compared head-to-head within the same contemporary group (i.e. no sub-grouping on breed type; 50% breed content animals can be compared in the same contemporary group as 100% breed content animals). This model accounts for the effects of heterosis.

In April 2019, Blonde d’Aquitaine BREEDPLAN upgraded from a partial crossbred analysis to a full crossbred analysis. This Full Crossbred Analysis Implemented for Blonde d’Aquitaine means that all purebred Blonde d’Aquitaine animals are now able to be compared in contemporary groups with crossbred Blonde d’Aquitaine animals (e.g. Blondeman). This is possible because the full crossbred analysis makes an allowance for the effects of heterosis being expressed when breeds are crossed. Blonde d’Aquitaine breeders may observe changes in EBVs and EBV accuracy for some animals as a result.

For further information, please contact Catriona Millen, SBTS Technical Officer, on (02) 6773 3357 or via email