Measurements are taken simply by properly
inserting the probe into the vagina and taking a reading. No prior
technical knowledge on the part of the operator is needed. The instrument's
functional shape allows easy usage by one person and no help is
needed to take measurements. One or two daily readings for several
successive days are recommended for fail-safe detection of ovulation.
Estrous detection (see picture) depends
on identifying the period when resistance is minimum and the following
sharp rise. The rise in resistance indicates ovulation within a
few hours and is the best period for insemination or mating.
Detection of Pregnancy
Readings should be taken again after insemination
or mating when the next estrous cycle would normally be due. If
resistance remains high for a few days it will mean gestation is
in progress. On the other hand a fall in resistance to levels met
during estrous will indicate the animal is not pregnant.