Significant emphasis has been placed on the importance of fertility in the female, whether in the cow or a developing heifer. When we address fertility in one female, we are affecting one offspring. When we address fertility in one male, we could be affecting up to approximately 35 offspring, in a single year. Is this oversight on bull fertility because bulls are overlooked until it is time to turn them out for the breeding season? We know that reproductive failures can occur in any cow-calf operation and can be costly. Let’s take the bull out of that negative equation and take a look at the top 6 factors I believe affect bull fertility.