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The digestive capacity of the caecum-colon and the value of the nitrogen absorbed from the hind gut for protein synthesis in pigs

Published online by Cambridge University Press:  09 March 2007

A. Just ,
H. Jørgensen  and
J. A. Fernández
A. Just
Affiliation:
The National Institute of Animal Science, Rolighedsvej 25, 1958 Copenhagen V., Denmark
H. Jørgensen
Affiliation:
The National Institute of Animal Science, Rolighedsvej 25, 1958 Copenhagen V., Denmark
J. A. Fernández
Affiliation:
The National Institute of Animal Science, Rolighedsvej 25, 1958 Copenhagen V., Denmark
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Abstract

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1. The aim of the investigation was to study the effects of lysine, methionine, crude protein, a complete balanced diet, maize starch and potato starch infused continuously into the caecum on the digeslibilly of the nutrients, urinary nitrogen excretion and N balance in the presence of a normal or a depressed (modified) microflora.

2. The effects of the infused nutrients on digestibility differed when diets supplemented with antibiotics were compared with unsupplemented diets.

3. Infused lysine improved the digestibility of crude protein (0·004/g lysine), crude fibre (0·01/g lysine), gross energy (0·003/g lysine) and lysine (0·03g lysine) when the diets were not supplemented with antibiotics.

Infused lysine, methionine and crude protein seemed to be of very little value for protein synthesis in the pigs, as the effects on N balance, although positive, were very small.

5. Despite the fact that a part of the infused lysine passed through the caecum-colon and into the faeces intact, the effect on N balance was negligible, indicating that the ability to absorb amino acids through the gut wall in the caecum-colon was very poor.

6. Crude protein, a complete balanced diet, maize starch and potato starch infused into the caecum were digested almost as well as if they had been given orally, thus demonstrating the large digestive capacity of the caecum-colon.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 46 , Issue 1 , July 1981 , pp. 209 - 219
Copyright
Copyright © The Nutrition Society 1981

References

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