Measurements of the contractions of mammary gland tissue are widely used for the assay of oxytocin both in vivo (Tindal & Yokoyama, 1962; Bisset, Clark, Haldar, Harris, Lewis & Silva, 1967) and in vitro (Mendez-Bauer, Cabot & Caldeyro-Barcia, 1960; Rydén & Sjöholm, 1962; Moore & Zarrow, 1965). It is generally accepted that this tissue is more selective than any other mammalian tissue currently used. The recently developed method of van Dongen & Hays (1966) for assaying oxytocin on rat mammary gland tissue in vitro is the most sensitive method so far devised. In this method the time of the beginning of milk expulsion is measured by means of microscopical observation of minute pieces of rat mammary gland. In our experience, however, the precision of this method is not suitable for quantitative measurements of relatively small changes of the oxytocin level in blood. In an attempt to measure the microscopically observed
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