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An illustrated description is given of the Estral electronic device, developed in Czechoslovakia, which has been successfully used for the detection of oestrus in cows and sows, by measuring electrical impedance values of vaginal mucus.

Podaný, J.; Stejskal, J.; Olič, I.; Vaníčec, J.; Laciga, P.
Tierärztliche Umschau, 1991, 46, 1, pp 35-39