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PYRUVATE METABOLISM IN SPERMATOZOA 305 2*5, and DNP caused a smaller or no further increase of respiration. 5 . When sixty sperm samples of good motility from sixteen bulls were tested in the presence of fluoride, it was found that they could be grouped according to the type of their respiratory response to pyruvate and pyruvate+DNP. A correlation appeared to exist between the metabolic behaviour of sperm samples under the experimental conditions described and the fertility of their donors as com- puted from their breeding record in artificial insemination.
W Bartley (Thu,) studied this question.