Testis of pigeon (Columba livia domestica) exposed to Thiram 5 mg/Kg/day for 10 weeks and subjected to long photoperiod (19L:5D), H&E. Magnification x10 and x40. L, lumen; Sp, spermatozoa; SG, spermatogonia; SC, spermatocyte; SD, spermatide. Degenerative in the histoarchitecture of testis are seen. Irregular somniferous tubules with all successive stages of spermatogenesis, some malformed spermatozoa in the lumen, slight decrease in Sertoli cell counts and a decrease in the interstitial spaces.