Abstract
Intra-uterine pressure changes have been successfully recorded in ewes in late pregnancy and during parturition using endoradiosondes (Hindson, Schofield, Turner & Wolff, 1965; Hindson, Schofield & Turner, 1968). This device is superior to intra-uterine balloons, for the sonde is not fixed in the uterine cavity and has no connexion with the exterior. Furthermore, in rabbits, recordings may be made with the aerial around the cage, not the animal, as is necessary to pick up adequate signals in the sheep. Thus the animal is unrestrained and undisturbed, being free to move in the cage while continuous recordings are made over several days. It was thought appropriate, therefore, to extend radio-telemetry recordings to the rabbit and supplement information already obtained with intra-uterine balloons (Fuchs, 1964; Porter & Schofield, 1966). Large New Zealand White rabbits were used in order to diminish the sonde/foetus size ratio. On the 23rd day of pregnancy the
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