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Influence of Protein Supply on Threonine Efficiency and Threonine Catabolism in Hepatic Mitochondria of Chicks and Rats Cover

Influence of Protein Supply on Threonine Efficiency and Threonine Catabolism in Hepatic Mitochondria of Chicks and Rats

Open Access
|Jan 2016

Abstract

This research investigated the relationship between efficiency of threonine (Thr) utilization and Thr oxidation in hepatic mitochondria in chicks and rats fed with graded levels (5.5-33.0% CP for chicks, 6-24% CP for rats) of protein. Calculation of efficiency of Thr utilization was based on N-balance data and an exponential N-utilization model, and Thr dehydrogenase (TDG) activity was determined. According to the results, no significant effect on TDG activity was observed in the liver of chicks who received diets containing from 5.5 up to 16.5% CP. However, significantly elevated TDG activities were observed, despite limited supply of Thr in protein, with diets containing from 22.0 up to 33.0% CP. At the levels of CP content from 5.5 up to 27.5%, no significant change in efficiencies of Thr utilization was observed. However, a significant decrease in efficiency was observed with diets containing from 27.5 to 33.0% CP. In chicks, the relationship between oxidation of Thr and Thr efficiency was observed with graded CP levels. In addition, elevated TDG activities in rat liver were observed with diets containing from 6.0 to 12.0% CP. At the levels of CP content from 6.0 up to 24.0%, no significant effect on efficiency of Thr utilization was observed in rats. In addition, no relationship was observed between Thr oxidation and efficiency of Thr utilization with graded CP levels in rats. Taken together, reactions for TDG appear to be animal species-dependent.

DOI: https://doi.org/10.1515/aoas-2015-0066 | Journal eISSN: 2300-8733 | Journal ISSN: 1642-3402
Language: English
Page range: 223 - 234
Submitted on: Jan 6, 2015
Accepted on: Sep 25, 2015
Published on: Jan 23, 2016
Published by: National Research Institute of Animal Production
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2016 Chul Won Lee, Rongjie Zhao, Il Je Cho, Sung Hui Byun, Young Woo Kim, Youn Sook Kim, Sang Chan Kim, Won G. An, published by National Research Institute of Animal Production
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.