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  • Title: Influence of the oviduct on sperm capacitation in the rabbit.
    Author: Seitz HM, Rocha G, Brackett BG, Mastroianni L.
    Journal: Fertil Steril; 1970 Apr; 21(4):325-8. PubMed ID: 5508501.
    Abstract:
    In an effort to evaluate the influence of the oviduct on sperm capacitation, in vitro fertilization of freshly-ovulated rabbit ova was used to assay the fertilizing ability of spermatozoa. New Zealand white rabbits were used. 9 1/2 hours after injection of human chorionic gonadotrophin half the animals had fimbriae of both tubes resected; 2 hours later, the ovaries were excised and the ova in cumulus removed from the surface of the ovaries. Half the animals serving as donors of uterine spermatozoa had their oviducts removed; half were intact. Both had spermatozoa recovered from their uteri 6-48 hours after mating. Study technique is detailed. Studies of 617 ova showed best fertilization rates when spermatozoa had remained in the uteri 16-18 hours. Spermatozoa recovered from capacitators without oviducts produced similar cleavage rates as those with intact oviducts. Results indicate that spermatozoa can be capacitated in the uterus of rabbits without oviducts but it is possible that part of the capacitation normally takes place in the oviducts. Others have shown capacitation takes longer by several hours with the uterotubal junction ligated than when this junction is patent. Ova were fertilized by spermatozoa recovered from the uterus after 8 hours but not by those recovered after 6 hours. In the present experiment spermatozoa recovered from the uterus 36 hours postcoitus were still able to fertilize ova.
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