Studies of the spermatogenic cycle and quantification of the germ cells during winter and s mer in buffaloes revealed that the total number of germ cells decreased in summer The sperma tids were the highly affected cells, while the number of spermatogonia was stable. The early differentiated type of spermatocytes pre leptotene and leptotene were not affected. The advancely dif-' ferentiated types zygotene and pachytene demonstrated significant decrease. The decrease in the number, of secondry spermatocytes was associated with stunted mioses.' Thë sértoli cells decreased in summer and the sertoli dell ratio was un representative. The diameter of semineferous tubules was sensitive index to the condi tion of the spermatogenic cycle. The number of Jeydig cells was stable, but their cytoplasm showed degenerative changes.