Device for automated detection of estrus in farm animals

A transmitter for transmitting an output signal which is a function of resistive and reactive components of impedance of tissue in a reproductive system of a female animal, the transmitter comprising:

• first and second electrode means for making electrical contact with the tissue;
• means for supplying first and second current pulses of first and second different pulse widths to the first and second electrode means;
• means for sampling a holding a first voltage and a second voltage produced across the first and second electrode means as a result of the first and second current pulses, respectively;
• means for converting the first and second voltages to first and second time periods;
• and
• means for producing an output signal which is a function of the first and second time periods.

A transmitter for transmitting an output signal which is a function of resistive and reactive impedance of tissue in a reproductive system of a female animal, the transmitter comprising:

• first and second electrode means for making electrical contact with the tissue;
• means connected to the first and second electrode means for providing a first signal which is a function of measured resistive impedance between the first and second electrode means;
• means connected to the first and second electrode means for providing a second signal which is a function of measured reactive impedance between the first and second electrode means;
• and
• output means responsive to the first and second signals for transmitting an output signal from which separate values of measured resistive and reactive impedance can be derived.