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OCR: ns in systemic Spermatogenesis is sensitive to alterati temperature, and brief increases either i emporary or local temperature can be followed by cohol, decreases in sperm production. Drugs, a stress may environmental agents and psychologica also cause decreased sperm count. ction after Persistent abnormalities of testicular fur Itary puberty can be due to hypothalamic-pitt malities of abnormalities, testicular defects, or abno ns affect sperm transport. Some of these conditio selectively, Leydig cell function or spermatogenesis on and but most cause both underandrogenisati sterone infertility. Even partial decreases in test production can cause infertility.