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The cost of the conversion of L-methionine precursors in mammals and birds
- Source :
- 6. International Symposium on Energy and Protein Metabolism (Isep), 6. International Symposium on Energy and Protein Metabolism (Isep), Sep 2019, Belo Horizonte, Brazil. ⟨10.3920/978-90-8686-891-9_108⟩, Publication-European Association for Animal Production (EAAP), Energy and protein metabolism and nutrition. (138)2019; 6. International Symposium on Energy and Protein Metabolism (Isep), Belo Horizonte, BRA, 2019-09-09-2019-09-12, 365-366
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- To fulfil the requirements for methionine, animal diets are widely supplemented with synthetic methionine sources such as L-methionine (L-Met), DL-methionine (DL-Met), and DL-2-hydroxy-4-(methylthio)-butanoic acid (DL-OH-Met). The objective of this study is to calculate the energy cost of the different conversion steps leading to L-Met and to propose energy equivalence values for DL-Met and DL-OH-Met, relative to that of L-Met. The conversion of DL-OH-Met to L-Met involves a nitrogen-sparing effect, because excess nitrogen can be used for the transformation of DL-OH-Met to L-Met, rather than being excreted as urea or uric acid Consequently, the ME-to-GE ratio of DL-OH-Met is 109% in mammals and 114% in birds, compared to the value of DL-Met. Because of differences in metabolism and the formation of hydrogen peroxide in the conversion to L-Met, the NE-to-ME ratios are 96% for DL-Met and 100% for DL-OH-Met in both mammals and birds. The conversion of DL-OH-Met to L-Met is therefore energetically less costly than the conversion of DL-Met. The stoichiometric approach presented here only considers the biochemical conversion steps, without considering the cost of transport and further transformation steps.
- Subjects :
- stoechiométrie
030309 nutrition & dietetics
métabolisme énergétique
[SDV]Life Sciences [q-bio]
7. Clean energy
03 medical and health sciences
chemistry.chemical_compound
biochemical analysis
oiseau
efficience
mammals
conversion
0303 health sciences
Methionine
énergie nette
0402 animal and dairy science
méthionine
analyse biochimique
mammifère
04 agricultural and veterinary sciences
040201 dairy & animal science
stoichiometry
acide aminé
Biochemistry
chemistry
amino acid
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- 6. International Symposium on Energy and Protein Metabolism (Isep), 6. International Symposium on Energy and Protein Metabolism (Isep), Sep 2019, Belo Horizonte, Brazil. ⟨10.3920/978-90-8686-891-9_108⟩, Publication-European Association for Animal Production (EAAP), Energy and protein metabolism and nutrition. (138)2019; 6. International Symposium on Energy and Protein Metabolism (Isep), Belo Horizonte, BRA, 2019-09-09-2019-09-12, 365-366
- Accession number :
- edsair.doi.dedup.....9ca92bb5d3bcd84ece51dd3e6e2f37a8