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Biology of Reproduction, Vol 13, 513-518, Copyright © 1975 by Society for the Study of Reproduction
1 Clinical Research Centre,
Harrow, Middlesex England and
Department of Obstetrics and Gynecology,
University College Hospital,
London, England A 300 fold range of epididymal sperm concentrations (0.3-90 x 105/ml) has been tested to
determine whether there is a relationship between sperm concentration and level of fertilization
achieved in vitro of mouse eggs. While very low concentrations (0.3-1.25 x 105/ml) resulted in
relatively low fertilization (43-64 percent), those in the range of 2.5-90 x 105/ml gave
fertilization rates of 80-94 percent. Consistently high results were obtained with sperm counts
above 30 x 105/ml and there was no evidence of reduction in fertility with very high sperm
concentrations. Likewise, no observable minimum was found; acceptable rates of fertilization were
achieved with a mean sperm:egg ratio of 417:1.
Accepted on August 27, 1975
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