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The duration of normal gestation and parturition in the rat can be changed by treatment with drugs which alter the equilibrium of the kallikrein-kinin system. The kallikrein inhibitor, aprotinin, when given from Days 19-22 of pregnancy prolongs gestation. Treatment with aprotinin from Days 20-22 of pregnancy prolongs the parturient process, as does a single dose given on the morning of Day 22. Kallikrein, when administered from Days 19-22 of pregnancy, results in a prolongation of gestation and abolishes the pre-parturient behaviour ('labour'). Parturition is prolonged and many fetuses are stillborn. Soya bean trypsin inhibitor when given from Days 19-22 of pregnancy delays and prolongs parturition; maternal haemorrhage occurs during birth and many fetuses are born dead or are abandoned at birth. It is suggested that the kallikrein-kinin system plays a functional role in the normal process of parturition in the rat.

The influence of drugs on the kinin-forming system in relation to pregnancy and parturition in the rat