Chumpol PholpramoolLucksana SornpaisarnMahidol University2018-04-302018-04-301980-01-01Contraception. Vol.22, No.6 (1980), 673-681001078242-s2.0-0019120783https://repository.li.mahidol.ac.th/handle/20.500.14594/11156Attempts have been made to assess the changes in Na + and K + concentrations in the cauda epididymal plasma and spermatozoa, and to correlate these parameters to changes in fertility shortly after castration in the rat. Fertility was markedly decreased 3 days after androgen withdrawal. By contrast, spermatocrit and Na + concentration in spermatozoa were increased on day 2 post-castration. Neither Na + and K + concentrations in the plasma nor K + inside spermatozoa were altered. The results are discussed in terms of a reduction in the epididymal secretion of macromolecules which are responsible for an increase in net Na + influx into sperm cells. © 1981, All rights reserved.Mahidol UniversityMedicineArticleSCOPUS10.1016/0010-7824(80)90092-X