[Karyometric analysis of the supraoptic nucleus and the paraventricular nucleus before and after milking the cow].

With mathematical-statistical methods the reaction of the Nucleus supraopticus (N.S.O.) and Nucleus paraventricularis (N.P.V.) were investigated before and after the milking of the cows. The frequency-distributions of the tests of the nuclear volumes in the N.S.O. and N.P.V. show an increase of the mean values of the nuclear volumes from the unmilked cows to those studied 15 minutes after the milking. The mean values of the nuclei volumes of the cows studied 60 minutes after the milking fall off, but they are higher than the values of the unmilked cows. The results of the histological-histochemical investigations mainly coincided with the results obtained by caryometry. It is discussed, that the changes in the nuclear bolumes show an increased protein synthesis and that -- combined with the release of oxytocin -- the milk stimulus caused a secretory synthesis in the neurosecretory cells, mainly in the N.P.V.