Seasonal Variation in the Succinic Dehydrogenase Activity of Bovine Spermatozoa

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Abstract
The effect of season upon the succinic dehydrogenase activity of bovine spermatozoa was investigated by a manometric method. The succinic dehydrogenase activity varied in a manner significantly correlated with the mean monthly temperatures; a decreased activity being found at higher environmental temperatures. Hence, the succinic dehydrogenase activity is at its lowest level during the period when fertility is low. Washing of the sperm cells also affected succinic dehydrogenase activity. A stimulation was produced during the summer months, but during the fall months there was an apparent slight inhibition.