During the April 2023 data release, ANAFIBJ has updated the Calving Ease Index. The calculation model used so far (Sire Model*) has been replaced with the Animal Model**. In addition, the data used for the calculation are now much more precise, thanks to the update of the editing process.
In the last years, the genetic programs paid particular attention to the selection of A.I. bulls: this allowed to obtain a population that shows fewer and fewer problems at birth. As a matter of fact, from the first graph it can be seen that the phenotypic trend of difficult births has decreased. As already happened in other countries, the Calving Ease Index will be more compressed due to the smaller differences within the population, as shown in the second graph.
Bulls with a genetic value of 100-102 now have good easy calves. Higher the index, easier the calvings.