Cross-sections of testes at 20x magnification from a nonvaccinated llama (a) and vaccinated llamas at week 3 (b), 6 (c), 9 (d), and 12 (e) following initial treatment. There was no effect of GnRH immunization on spermatogenesis at any time point based on seminiferous tubule scoring () on Leydig cell morphology () or density ().