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The milk-ejecting potencies of deamino-oxytocin and oxytocin were compared by means of recordings of intramammary pressure in lactating women.

No difference in milk-ejecting potency was found between the two peptides in one woman 16 months after delivery; at this time her blood did not inactivate either of the peptides.

In other women on the third day post partum, deamino-oxytocin was found to be 1·5 times as potent as oxytocin (w/w). At this stage, the blood of the patients inactivated oxytocin (half life: 10 min.) but not deamino-oxytocin; this effect accounts only in part for the difference in potency between the two peptides.

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				L. A. Branda, B. M. Ferrier, G. Archimaut, E. A. Marchelli, and B. Rucanski Deamino-oxytocin: Inactivation by Plasma of Women in Labor Science, April 5, 1968; 160(3823): 81 - 82. [Abstract] [PDF]