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Degradation of maize protein in rumen contents Influence of ammonia concentration

Published online by Cambridge University Press:  09 March 2007

J. Anna Níkolić  and
R. Filipović
J. Anna Níkolić
Affiliation:
Institute for the Application of Nuclear Energy in Agriculture, Veterinary Medicine and Forestry, Zemun-Belgrade, Yugoslavia
R. Filipović
Affiliation:
Institute for the Application of Nuclear Energy in Agriculture, Veterinary Medicine and Forestry, Zemun-Belgrade, Yugoslavia
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Abstract

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1. The influence of ammonia concentration on the distribution of nitrogen derived from opaque-2 maize uniformly-labelled with 15N has been investigated during short-term in vitro incubation of bovine rumen contents.

2. Less 15N derived from maize was found in the non-protein-N (NPN) fraction during incubation without added NH3 than with added NH3, due entirely to differences in the amount of N derived from maize in the NH3 fraction.

3. From calculations based on the transfer of N derived from maize to the NPN pool and to a bacterial fraction, it was concluded that degradation of maize protein was not influenced by NH3 concentration within the examined limits.

4. The decrease in relative amount of N derived from maize in the NH3 fraction at low concentrations of NH3, together with evidence for an increased fractional turnover rate of NH3-N suggests that a deficient supply of NH3 is compensated for by increased catabolism of nitrogenous compounds derived from the rumen micro-organisms.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 45 , Issue 1 , January 1981 , pp. 111 - 116
Copyright
Copyright © The Nutrition Society 1981

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