Biochemical studies on the semen of domestic animals; On the chemical composition of seminal plasma of rams. I.

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Fructose and ascorbic acid in the seminal plasma of two rams were measured through a year to examine the seasonal variation and their relationship to spermatogenesis.<BR>1. The concentration of fructose changed according to the breeding and non-breeding seasons appearing in ewes. That is, a noticeable increase was recognized during September-December (the breeding season), while extreme decrease was seen during March - July (the non-breeding season). January - February showed falling, while July - August showed rising tendency.<BR>2. The present results suggested that there was seasonal variation in the secretory function of ram's sex accessory organs.<BR>3. Judging from decrease in sperm concentration and index of motile spermatozoa and drop in pH of the semen during summer, passing hypo-spermatogenesis in the seminiferous tubes might be caused by the high temperature and humidity. However, there was no direct relationship between the phenomenon and the concentration of fructose.<BR>4. The concentration of ascorbic acid tended to increase during January - June, and decrease during, July - December.
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