One of the popular myths presented at this time of the year is that proofs for young genomic AI bulls don’t stack up and that, as a result, farmers would be better to stick to using daughter-proven or even stock bulls when breeding dairy female replacements. Is there evidence to support this assertion or should farmers continue to use teams of young genomic AI bulls?To answer the question, the ICBF undertook an analysis of 2019 co-op performance report data from 10,553 spring-calving dairy herds. A total of 1.06m cows were included in the analysis, with the herds categorised into three groupings as follows: