azoospermia, this however, is dependant solely on the nature of the dose that are delivered to the testes. Those who experience less than 100 rads will recover in 9–18 months, doses of 200-300 rads will recover in 30 months and doses of 400-600 rads will recover in less than or equal to five years. An irreversible sterility may occur however, for those experiencing a single dose field with 600-800 rads. Nutritional Factors Studies have shown that Vitamin A deficiencies in rats , as well as zinc deficiencies in human males may prevent the normal functioning of spermatogenesis. Heat Heat may also be the cause of oligozoospermia which can lead to both partial and reversible spermatogenic arrest. Infections After the occurrence of an infectious disease in humans, such as hypothermia and/or the presence of toxic or infectious factors spermatogenic arrest is likely to follow, however, the condition may be normalized once antibiotic and anti-inflammatory treatments have been put into effect. Treatment Various treatments have been discovered in order to aid those with spermatogenesis arrest, one of these being through the use of arginine. A study done by Jungling and Bunge in 1976 had a small breakthrough in the field by orally distributing arginine, daily to a group of infertile men. Of the eighteen men in the test group only one experienced an increase in sperm count, while others saw no improvement; these men also experienced a decreased sperm motility. However, one of the patients in the group successfully impregnated his wife while taking part in the study. More recently, more successful treatments have been developed, such as through the use of gonadotropin treatment. A study conducted by Selman and El-Danasouri in 2006 proved that using long-term gonadotropin therapy on infertile men can improve sperm production quantitatively and increase sperm population in some patients and can in turn provide a successful in-vitro fertilization treatment. These results were found using men that had normal hormone levels but had spermatogenic arrest. These men were treated using FSH treatments and had testicular biopsy's performed on them before and after the treatment had been administered in order to track progress. References External links Microscopic images of spermatogenesis arrest Fertility