Summary. The vasotocin level in the blood of hens during oviposition was determined on the isolated bladder of the frog, Rana esculenta. It was found that 10 min before oviposition, the vasotocin level in blood suddenly increased. During oviposition, it was forty-six times higher (P<0·01) than that in hens with no egg in the uterus. After oviposition, the activity of vasotocin in the blood rapidly decreased.
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Niezgoda et al. (1973) studied this question.
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