c1e1e402_PERMATOGENESIS_IN_FARM_ANIMALS__Function
[Hormone] Testosterone [Secretion From] Leydig cells [Function] 
§ Necessary for normal sperm development. § It activates genes in Sertoli cells, which promote differentiation of spermatogonia.
Veterinary Gynaecology blogs: HORMONAL CONTROL OF SPERMATOGENESIS IN FARM ANIMALS
Function