Abstract
Nutritional requirements across the portal-drained viscera of preruminant calves were determined using an arteriovenous difference technique. In the current studies, a bilateral subcostal approach was used to reach the portal area to provide access for proper placement of an ultrasonic transit time flow probe around the portal vein. The application of an ultrasonic flow probe provided consistent measurements of blood flow. The umbilical vein was used as an entry point for the portal vein catheter. The femoral artery was also catheterized. Using blood flow measurements and arteriovenous differences we could measure net nutrient uptake. This model has been performed successfully on healthy calves, but the study may have implications in the development of treatment to promote intestinal healing in diarrheic calves.
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