The oxytocic activity of the jugular blood plasma of bulls before and after copulation, ejaculation into an artificial vagina, massage of the seminal vesicles and ampullae and stimulation with an electroejaculator increased from below 0\m=.\01 \g=m\U/ml to a peak level varying from 2 to 1000 \g=m\U/ml 4 to 6 min after ejaculation or 6 to 9 min after the start of electrical or manual stimulation.
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