the total numbers of leydig , sertoli and stem cells ( a0 + a1 ) were not affected by the treatments , but the size of the leydig and the sertoli cells , the efficiency of spermatogenesis ( i.e . the number of male gametes produced by an a1 spermatogonium ) and the daily sperm production were all significantly reduced in the rams exposed to long days .
C0037864
spermatogenesis
C0037868
sperm