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Level of food intake and the passage of markers and nitrogen along the alimentary tract of sheep

Published online by Cambridge University Press:  09 March 2007

R. A. Weller ,
A. F. Pilgrim ,
F. V. Gray ,
M. N. Taylor ,
R. A. Weller  and
C. S. W. Reid
R. A. Weller
Affiliation:
Division of Nutritional Biochemistry, CSIRO, Adelaide, South Australia
A. F. Pilgrim
Affiliation:
Division of Nutritional Biochemistry, CSIRO, Adelaide, South Australia
F. V. Gray
Affiliation:
Division of Nutritional Biochemistry, CSIRO, Adelaide, South Australia
M. N. Taylor
Affiliation:
Division of Nutritional Biochemistry, CSIRO, Adelaide, South Australia
R. A. Weller
Affiliation:
Division of Nutritional Biochemistry, CSIRO, Adelaide, South Australia
C. S. W. Reid
Affiliation:
Division of Nutritional Biochemistry, CSIRO, Adelaide, South Australia
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Abstract

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1. The relative rates of passage of polyethylene glycol (PEG) and lignin through the alimentary tracts of sheep were examined through the ratio of these two markers in the fodder and in the contents of various segments of the gut. A much faster turnover of PEG than of lignin in the stomach compartments suggested that samples from these organs could not be representative of the digesta flowing through them. Average PEG:lignin ratios in the small and large intestines were close to the ratio in the fodder, indicating that sampling from the duo-denum in the living animal could possibly yield material representative of that flowing from the stomach to the small intestine. Similar results were obtained for high and low levels of fodder intake.

2. A procedure was developed for automatic sampling from the duodenum for prolonged periods, and the material collected was shown to be representative of digesta flow. Simpler methods of sampling from the duodenum were shown to be liable to relatively large errors.

3. The amount of nitrogen reaching the duodenum in sheep given lucerne hay pellets was found to be equivalent to practically 100 % of the dietary N, whether the intake of fodder was 600 g/d or 1500 g/d.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 26 , Issue 3 , November 1971 , pp. 487 - 497
Copyright
Copyright © The Nutrition Society 1971

References

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