Preg-Test indicator is operated following the technique of acoustic probing of the body. The idea of technique is in the control over the changes in parameters of pulses reflected by inner organs when they are filled with liquids.
The probe applied to the sow’s body directs a beam of ultrasounds which, after reflection from the uterine horn filled with waters, return thus causing changes to the signal generated by the device. The green C indication accompanied by a sound signal points to the presence of amniotic fluids and thus means the sow is pregnant. The red K indication is a sign of a stable acoustic contact between the screen sensor and the skin.
Vegetable oil or engine oil can be used as contact lubrication.
The K indicator is also used to control the battery voltage. If the battery is charged, then on each press of the Start button the K indicator flashes for a short time. If the battery voltage is below the admissible level, then on pressing the Start button the microcontroller disables the light indication, and upon the repeated press the indicators are not glowing. In that case, the battery needs to be replaced.
Portable, easy to maintain, and efficient in operation, the instrument allows for a maximum precision of pregnancy diagnostics. This facilitates selection of pregnant animals and allows to avoid the costs related to feeding and maintaining barren animals.