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THE EFFECT OF VAGINAL AND CERVICAL STIMULATION ON OXYTOCIN RELEASE DURING THE LUTEAL PHASE OF THE COW'S OESTROUS CYCLE

While surgical transfer of bovine eggs presents little difficulty, non-surgical attempts at transfer by deposition into the uterus through the cervical canal have been singularly unsuccessful. The occurrence of uterine contractions can be recorded on a kymograph almost immediately after non-surgical manipulation of the uterus. Isolated successes have been reported, however, when the uterus was distended with carbon dioxide at the time of egg transfer (Rowson & Moor, 1966; Vincent, Mills & Rundell, 1969). It was found that both natural eggs and artificial eggs in the form of resin spheres of the same size and density were ejected from the uterus within a few hours of their non-surgical deposition within the horn. A possible reason for this rejection might be the