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J. RZĄSA and Z. EWY

Summary.

In anaesthetized hens, intravenous injections of vasotocin and oxytocin increased the intrauterine pressure. The response to vasotocin was much more intensive than to oxytocin.

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J. RZĄSA and Z. EWY

Summary.

Intravenous injection of vasotocin in the hen induced premature oviposition within a few minutes. The sensitivity of the oviduct both to vasotocin and oxytocin rose towards the time of normal oviposition. Vasotocin exhibited a much greater oviposition-inducing activity than oxytocin.

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J. NIEZGODA, J. RZĄSA and Z. EWY

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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Z. EWY, T. KOŁCZAK, S. WIERZBOWSKI and E. WIERZCHOś

Klumbies & Kleinsorge (1950) and Fox & Fox (1969) recorded blood pressure, heart rate and respiratory changes during ejaculation elicited by masturbation and natural coitus. Jakubowski (1966) reported that a rise in the heart rate occurred and Wierzchoś (1970) observed a rise in blood pressure, heart rate and respiratory rate during copulation in the boar. According to Wójcik (1969), the blood in copulating rams contains substances which induce incomplete contractions of the isolated vas deferens. Gudat & Schnell (1970) found that the levels of erythrocytes, leucocytes, haemoglobin, plasma glucose and transaminases, GOT and GPT, were higher in boars immediately after copulation than before it. Changes in the blood constituents of the male during copulation do not, however, appear to have been described until now. Since copulation in the