The advent and implementation of genomic selection in dairy cattle has prompted significant changes within the industry from an animal management and breeding perspective. An increased emphasis on decreasing generation intervals has greatly influenced the management of bulls at artificial insemination (AI) organizations. Prior to genomic selection, the genetic value of an AI sire was determined by examining the phenotype and production traits of his daughters (i.e., proofs), and the average age at which sires were debuted to the industry (proven) was between 4 to 5 years. Today, only one decade after the introduction of genomics to the industry, unproven genomically tested sires between 1.5 and 4 years of age account for greater than 50% of AI unit sales for most major AI organizations. Accordingly, bulls destined for AI use receive optimum care and nutrition from birth to diminish developmental delays, and there is a renewed interest in examining the effects of nutrition and endocrine modulation on the attainment of puberty and testicular development in bulls. A recent report from our laboratory demonstrated that a follicle-stimulating hormone (FSH) treatment regimen administered prepubertally hastened puberty attainment (ability to ejaculate 5 × 10⁷ sperm, 10% motile) to 9 mo of age in Holstein bulls. This treatment regimen also positively affected testicular development (increased number of Sertoli cells per seminiferous tubule cross section at 5 mo of age in beef bulls) and altered the endocrine profiles of several key reproductive hormones related to puberty attainment. Importantly, the treatments had no negative effects on bull health or semen production later in life. In practice, hastening puberty in bulls can be used concurrently with modern techniques of oocyte collection in prepubertal heifers to minimize generation intervals in cattle, thus increasing the rate of genetic advancement. The usage of young genomic bulls will likely increase or remain stable in the future, and AI organizations will continue to focus on optimizing bull management to ensure top tier genetics are available to the industry.