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Biology of Reproduction, Vol 25, 785-791, Copyright © 1981 by Society for the Study of Reproduction
1 Department of Obstetrics and Gynecology,
School of Medicine,
University of California,
Davis, California 95616 Movement characteristics of hamster and guinea pig spermatozoa were studied by high-speed
cinemicrography before and after initial binding to the zona pellucida. Hamster spermatozoa that
had previously undergone motility activation in vivo or in vitro maintained vigorous behavior upon
zona attachment. They continued to propagate flagellar waves of large amplitude and curvature, although these waves were much more symmetrical than when prior to zona attachment. The hamster
sperm activated in vitro appeared slightly stimulated upon zona attachment. Such spermatozoa also
bound to the zonae pellucidae of mouse eggs, and they exhibited similar movements. Preactivated
hamster spermatozoa, fresh from the epididymis, did attach to the hamster zona, but exhibited
relatively weak flagellar beats of low amplitude and frequency. Guinea pig spermatozoa, activated
in vitro, also continued such movement and appeared somewhat stimulated upon attachment to
the zona pellucida of their species.
2 Department of Anatomy and Reproductive Biology,
John A. Burns School of Medicine,
University of Hawaii,
Honolulu, Hawaii 96822
Accepted on July 8, 1981
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