In most species there is a release of oxytocin during the expulsive phase of labour with little or no release during the earlier stages (see Chard, 1972). However, information is lacking on the release of arginine-vasopressin (AVP) during parturition. It appears to be released in the rat (Fuchs & Saito, 1971) but not in the goat (McNeilly, Martin, Chard & Hart, 1972). The present studies demonstrate the release of both oxytocin and AVP during parturition in the horse.
Thirty-one jugular blood samples (20 ml) were collected during labour in three Welsh ponies which produced live foals, 20 samples from three mares in early pregnancy and 25 samples from three mares after elective Caesarean operation. Plasma was separated immediately at 4 °C and stored at -20 °C to obviate enzymic destruction. Oxytocin was determined by radioimmunoassay (Chard, Boyd, Forsling, McNeilly & Landon, 1970) and AVP by bioassay (Forsling, Jones & Lee,
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