New fertility index to hit rankings of Jersey bulls
A new fertility index looks set to hit the rankings of Jersey AI bulls when it is introduced before the end of the year.
The new index is a revamp of the existing calculation which attempts to evaluate a cow's inherent ability to go back in calf.
The ICBF geneticists behind the new index said that it would improve the reliability of fertility scores for bulls and provide them earlier in the case of young test bulls.
The ICBF board is due to meet in a fortnight to decide whether to go ahead with the incorporation of the new index into the bull rankings due in December.
However, there may be some resistance from Jersey breeders when they find out that Jersey bulls will effectively be the only breed to see the new index reduce their EBI scores.
ICBF data suggests that Jersey bulls will see their fertility indexes drop by €13, while Norwegian Red bulls will see theirs increase by €13.
Friesian bulls will rise by €11 on average, Montbeliards will be up by €12 and Holsteins will increase by €1.
As a result Norwegian Red bulls will jump €26 in overall EBI ahead of their Jersey counterparts.