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Excerpt from Bovine Obstetrics
During coition the penis in all probability enters the cervical canal, and the semen is poured into the uterine cavity. The spermatozoa may reach the egg either by their own movement or the antiperistalsis of the uterus and tubes. At the moment of ejaculation and already previously the uterus contracts, thus narrowing its lumen. Later the uterine muscle relaxes, a negative pressure, and aspiration of the semen follows, which is now carried to the oviduct by the factors already enumerated.
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