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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

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