the present results indicate , that ( 1 ) photoperiod is an important modulator of testicular lh receptor numbers in this species , ( 2 ) photoperiod or age has no significant effect on the binding affinity of lh receptors , ( 3 ) short photoperiods arrest the induction of lh receptors as well as the increase in leydig cell numbers associated with normal testicular maturation , and ( 4 ) changes in lh receptor numbers per testis correlate well with the photoperiod-induced changes in androgen biosynthesis , spermatogenesis and leydig cell morphology observed in our previous studies .
C0039597
testis
C0037864
spermatogenesis