MEASUREMENT OF DUODENAL FLOW IN DAIRY COWS BY EITHER TOTAL COLLECTION OR SPOT SAMPLING, USING A SPECIAL CANNULA

Abstract

Duodenal flow as derived from total collection and spot sampling was compared in three Friesian cows, using a re-entrant cannula without transecting the intestine. Cr 2 O 3 was used as a single marker. Small differences in flow of dry matter, organic matter and nitrogen indicate that the spot sampling procedure may render valid results. The mean recovery of Cr 2 O 3 was 96.7%. Key words: Cattle, duodenal flow, sampling technique, marker