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DIAGNOSIS OF OESTRUS AND OVULATION IN COWS BY pH-MEASUREMENTS INTRA VAGINAM AND BY APPARENT VISCOSITY OF VAGINAL MUCUS

During the oestrus of the sow it has been demonstrated that the pH intra vaginam decreases rapidly into the acid range (Schilling & Röstel, 1964). The minimal pH of 6·35 coincided with full oestrus and the time of mating. These findings have now been obtained in cows (Zust, 1966; Schilling & Zust, 1967). The most important results of these investigations are briefly dealt with in the following text.

In cows, the pH was measured intra vaginam using a pocket-type pH meter. An extra long electrode was moistened with distilled water immediately before the measurement was made. A Polanski speculum was used to locate exactly the measurement points within the vagina. In accordance with Täubrich (1959) a close relationship was found between these points and the pH: the lowest values