Spermatogenesis primary spermatocyte

Adult males given 500 mg Zn/kg ration, as ZnS04, for 6 weeks After 3 weeks, spermatogenesis was arrested at the primary spermatocyte stage. After 4 weeks, food consumption declined, forelimb lameness, and swelling in cervical lymph nodes. At 6 weeks, testes showed enlarged lumen and abnormal germinal epithelium. 20... 

A dramatic increase (approx. 50-fold) of the activity of the sulfotransferase involved in the biosynthesis of the SGG also occurred when spermatocytes first began to appear in rat testis (19) the rise in the activity of this enzyme preceded by several days a marked rise in the amount of the SGG. Studies on pre-puber-tal human testis (which is temporarily blocked in spermatogenesis at a stage prior to the appearance of primary spermatocytes) have shown that neither SGG nor GG is present (15,26). Similarly, the testis of the pre-pubertal fowl also lacks sulfogalactosylceramide, the sulfatide found in mature fowl testis (26). All of these find-... 

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