Abstract
Accurate diagnosis of pregnancy in does from one to 104 days before kidding was made by using an ultrasonic Doppler technique. Detection of pregnancy 106 days and more before kidding was not possible with external transducers. Prediction of multiple births has not been successful to date. The instruments are portable and can be used anywhere, since they employ are chargeable battery pack as a source of power. Instruments with a frequency of 5MHz seem to be superior for early detection of pregnancy, whereas those with a frequency of 2.25MHz may be superior for the detection of fetal heart movement in fetuses near term.
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