EVALUTION AND SEASONAL VARIATION OF SEMEN QUALITY IN YOUNG MEDICAL STUDENTS

Abstract

Evaluation of semen quality as performed on specimens obtained from 126 young and healthy students, in our medical university for 2 years, from November, 1976 to November, 1978. Seminal volume was 3.0±0.9ml (mean+sd). Sperm density, total sperm count, rate of motile spermatozoa, total count of motile spermatozoa, rate of active spermatozoa by eosine-test and rate of abnormal spermatozoa in 125 subjects, except one with azoospermia, were 106±50 million/ml, 313±165 million/semen, 62±12%, 192±111 million/semen, 80±8% and 11±2%, respectively.
The values of sperm density and total sperm count in the group with the past history of mumps before puberty were the same as those in the group without mumps.
Seasonal variation of sperm density and total sperm count was observed on 9 cases of medical students, from whon we could take their semen constantly for one year, from December, 1977 to November, 1978. Both factors were highest in autumn, (September and October) and lowest in summer, (June and July). The seasonal variation of seminal volume, rate of motility and rate of abnormal spermatozoa was not observed significantly.
Sperm density and total sperm count in young medical students were higher than the results of fertile group which had been reported previously by some authors. Furthermore, it is strongly suggested that there is a seasonable variation of sperm density and total sperm count in humans as in some kinds of animals.