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Studies on digestion and absorption in the intestines of growing pigs

5*. Measurements of the flow of nitrogen

Published online by Cambridge University Press:  08 December 2008

A. G. Low
A. G. Low
Affiliation:
National Institute for Research in Dairying, Shinfeld, Reading, Berks. RG2 9AT
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Abstract

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1. Digesta were collected from twenty-three pigs, initially of 30 kg live weight, and fitted with single Ash re-entrant cannulas in either the duodenum, jejunum or ileum. A further twenty-four pigs were used in a conventional digestibility trial.

2. Three approximately isonitrogenous diets were used; they contained: barley, fine wheat offal, white fish meal, minerals and vitamins (diet BWF), starch, sucrose, maize oil, cellulose, minerals, vitamins and either groundnut (diet SSG) or casein (diet SSC).

3. The flow-rates of nitrogen (N), liquid-fraction N (LN) and non-protein liquid-fraction N (NPLN) were measured hourly in the duodenum and jejunum and every 6 h in the ileum during 24 h collection periods. Faeces were collected during 5 d periods.

4. Marked increases in flow of N, LN and NPLN were seen in the duodenum and jejunum after feeding each diet, but not in the ileum.

5. Values for, N output: intake from the duodenal, jejunal or ideal cannulas and in faeces in 24 h periods were respectively: 0.98, 0.88, 0.25 and 0.21 for diet BWF; 1.00, 0.97, 0.22 and 0.24 for diet SSG; 0.98, 0.73, 0.09 and 0.03 for diet SSC. The corresponding values for LN in the duodenum, jejunum and ileum respectively were: 0.53, 0.53 and 0.12 for diet BWF; 0.46, 0.60 and 0.13 for diet SSG; 0.57, 0.50 and 0.06 for diet SSC. The corresponding values for NPLN in the duodenum, jejunum and ileum respectively were: 0.41, 0.38 and 0.09 for diet BWF; 0.35, 0.36 and 0.08 for diet SSG; 0.46, 0.38 and 0.04 for diet SSC.

6. The results are discussed in relation to similar studies, particularly in pigs with duodenal cannulas, in which widely different observations were made.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 41 , Issue 1 , January 1979 , pp. 137 - 146
Copyright
Copyright © The Nutrition Society 1979

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