| 5.
The trocar-cannula, with the push rod inside, is placed
4-7 inches (10-15cm) behind the end of the xiphoid (breastbone),
and 2-3 inches (5-7cm) to the right of the midline.
Perforate
the abdominal wall and the abomasum with a swift downward
push of the trocar.
BE
CAREFUL TO AVOID THE LARGE SUBCUTANEOUS ABDOMINAL VEINS
IN THIS AREA!
(Pre-marking with a colored marking
stick helps to locate the veins. However, should a vein
be accidentally perforated, a simple interrupted suture
can be placed at the site to minimize any bleeding.) The
handle is removed from the cannula, and the push rod is
run through the center of it to remove any skin plug, which
often is present.
6.
The distinct odor of abomasal gas may be identified at this
time, and if desired, a small amount of fluid can be extracted
via small diameter plastic tubing and checked for low pH
(2-4).
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