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Biology of Reproduction, Vol 13, 187-189, Copyright © 1975 by Society for the Study of Reproduction

Effect of Pretreatment of Rat Spermatozoa with High Concentrations of NaCl on Sperm Capacitation and Fertilization of Eggs in vitro

K. NIWA 1, and M. C. CHANG 1

1 Worcester Foundation for Experimental Biology Shrewsbury, Massachusetts 01545


Rat epididymal spermatozoa, pretreated in media containing various high concentrations of NaCl for 10 min, were used for in vitro fertilization of eggs obtained from immature rats. Although the proportions of penetrated eggs with enlarged sperm head were increased by treatment of spermatozoa in media containing 118.9 (357 mosmolal) to 138.9 mM NaCl (397 mosmolal), the proportions of penetrated eggs were the same whether spermatozoa were treated in isotonic or slightly hypertonic solution. Treatment of spermatozoa in medium containing higher than 158.9 mM NaCl (437 mosmolal) not only inhibits their fertilizing ability but also their motility.

Submitted on February 12, 1975
Accepted on May 13, 1975




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Copyright © 1975 by the Society for the Study of Reproduction.