An active succinic dehydrogenase was first demonstrated in the semen of man and bull by Lardy and Phillips (16) and MacLeod (22) by use of the Thunberg technique. Subsequently, Zittle and Zitin (~1) demonstrated the presence of cytochrome oxidase in bull spermatozoa, and Mann (24, 25) observed the complete eytochrome spectrum in the spermatozoa of man, ram, bull, and boar. However, MacLeod was unable to demonstrate any connection between succinate oxidation and the persistence of spermatozoan motility. Ryan (33) observed an increase in respiration of cold-shocked spermatozoa in the presence of succinate, which appeared to be associated with an increase in spermatozoan motility.
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Smith et al. (1956) studied this question.
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