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Summary. A plastic spiral IUD was inserted at laparotomy into one uterine horn of ewes in oestrus; in control ewes in oestrus, an IUD was inserted and removed immediately. In ewes mated 1 to 2 hr and again 5 hr after insertion of the IUD, sperm transport into the uterine horns and oviducts on both sides of the reproductive tract was inhibited and ovum fertilization prevented. The majority of uterine contractions were seen to be moving towards the oviduct in control ewes but towards the cervix in ewes with the IUD 5 hr after its insertion. This may account for the inhibition of sperm transport.
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Harold W. Hawk (1970) studied this question.
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