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SUMMARY At and for about 3 days after oestrus the utero-tubal junction of the ewe has a valve-like action which prevents fluid under pressure in the uterine (Fallopian) tube from entering the uterus. This action appears to be the result of oestrogen-induced oedema and flexure of the wall of the utero-tubal junction.
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EDGAR et al. (1960) studied this question.
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