PREG-TONE II PLUS
®
INSTRUCTIONS
The
PREG-TONE II PLUS
emits high frequency sound waves called ultrasound from the
transducer (see diagram). The transducer must make proper skin contact with the sow in order
for ultrasound to penetrate. Proper skin contact will be made when an oil is used between the
skin of the sow and surface of the transducer. An intermittent tone is emitted when proper skin
contact is made and the button is pressed and held on.
The sow's uterus fills with amniotic fluid during pregnancy. When the ultrasound contacts
the amniotic fluid in the uterus it produces an echo. These echoes are received and processed
by the electronic circuits of the
PREG-TONE II
PLUS
and a continuous audible tone (beep) is
sounded indicating pregnancy
TEST RESULTS
When the transducer is applied to the skin though a sufficient amount of coupling fluid, an
intermittent tone (beeping) is heard, which indicates good skin contact. Pregnancy will then be
indicated by a change to a continuous tone. If after scanning, the tone does not change to a
continuous tone the intermittent tone indicates an open sow. It is possible to get the continuous
tone without first getting the intermittent tone.
You can begin testing sows as early as 18 days and as late as 75 days after breeding and
obtain accurate results. The testing done at 18 days should be repeated at 30 days after
breeding to assure an accurate test result.
PRETEST TO CHECK FOR PROPER OPERATION
Turn the instrument on by squeezing and holding with your thumb on the front center of the
case as shown in the diagram. An audible tone will sound, which indicates the unit is working
properly. If no sound is heard, read the instructions regarding malfunctions.
TESTING PROCEDURES
You will need a contact fluid, such as mineral oil or vegetable oil. During testing, isolate
and quiet the animal (feed her). Testing will take 15-30 seconds at first and about 5 seconds
after skill is developed.
Testing should first be done on the right side of the sow. Put a liberal amount of oil on the
on the sow, turn the instrument on, and place the transducer on the sow in the location shown in
the diagram. The best site for testing is located one inch above the nipple line and two inches
in front of the rear leg. Aim the ultrasound into the sow's body to scan across the uterus. This
is an angle of about 45 degrees forward and 45 degrees to the side. Aim for a spot above the left
front shoulder. Rotate and press the instrument against the skin to express air bubbles—
ultrasound cannot penetrate air
. Move the instrument
so as to scan an arc across the uterus.
You should hear an intermittent beep that indicates good skin contact. If sow is pregnant, it
will turn into a continuous beep. Remember to apply oil every time you test a sow. If the sow
tests open when you test on the right side, repeat the testing procedure on the left side, to be
sure the test is correct.