Seasonal changes in the expression of molecular markers of stallion germ cells

•Infertility or subfertility due to seasonal changes in the stallion's reproductive efficiency influences the economics of farmers•Self-renewal and differentiation of spermatogonial stem cells are the initial processes to maintain an adequate sperm population•Undifferentiated, differentiating, and differentiated spermatogonia express different molecular markers during spermatogenesis•The expression level of these putative molecular markers might be gonadotropin-dependent in stallion testes