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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