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Success at the first insemination is key to optimal reproductive performance in dairy cows. The fertility of lactating dairy cows has reportedly decreased over the last decades. In pasture-based systems, such as in Ireland and New Zealand, conception rates to the first insemination vary between 39 and 52%, while the rates in feedlot systems are as low as 30 to 40% [1]. A failed insemination may lead to an increase in calving interval, insemination numbers, reproductive treatment, feeding, culling, and replacement heifers. All of these lead to additional costs that can sum up to an average of 290 euros [2].