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One day later, there was a marked increase in the vascular supply of the testis, and numerous vessels appeared to have breached the membrana propria of the tubules. Kochar NK, Harrison RG. The effects of x-rays on the vascularization of the mouse testis. Fertil Steril 1971;22:53-57. The impact of temperature shock upon mammalian sperm is severe, and produces physical as well as biochemical alterations in the cells. Ackerman DR. Variation due to freezing in the citrate acid content of human semen. Fertil Steril 1971;22:58-60.