06 avril 2020

International genetic evaluation realised by Interbull, produce also between countries conversion formulae. Formulae used to convert French proofs into other country scale and vice versa are available (below). Interbull study on genomic data showed that these conversion formula are consistent for genomic proof conversion between countries.

Of course, these Interbull conversion formulae, have to be considered as a rough guide only and cannot substitute to official local release. Each country determine by its own only the status (official or not) of each proof. Moreover you should know that some countries may apply post processing transformations (scale, blending) not considered in these conversion formulae .

The general formula is:

Proof importer =a + b * Proof exporter

The coefficients a and b are estimated for every couple of country if there are at least 20 bulls in common..

You can find in the downloadable document all the formulae concerning France for production (milk, fat and protein), somatic cell score and conformation traits...

NB: conversion formulae with Switzerland for Simmental and Montbeliarde breeds consider proof expressed in Simmental Swiss base.

Laure Hugues (GenEval), Amandine Launay (Institut de l'Elevage)