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%.
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Röhr et al. (1984) studied this question.
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