Amino acid composition of rumen bacteria and protozoa in cattle

Journal of Dairy Science
M SokH Lapierre

Abstract

Because microbial crude protein (MCP) constitutes more than 50% of the protein digested in cattle, its AA composition is needed to adequately estimate AA supply. Our objective was to update the AA contributions of the rumen microbial AA flowing to the duodenum using only studies from cattle, differentiating between fluid-associated bacteria (FAB), particle-associated bacteria (PAB), and protozoa, based on published literature (53, 16, and 18 treatment means were used for each type of microorganism, respectively). In addition, Cys and Met reported concentrations were retained only when an adequate protection of the sulfur groups was performed before the acid hydrolysis. The total AA (or true protein) fraction represented 82.4% of CP in bacteria. For 10 AA, including 4 essential AA, the AA composition differed between protozoa and bacteria. The most noticeable differences were a 45% lower Lys concentration and 40% higher Ala concentration in bacteria than in protozoa. Differences between FAB and PAB were less pronounced than differences between bacteria and protozoa. Assuming 33% FAB, 50% PAB, and 17% of protozoa in MCP duodenal flow, the updated concentrations of AA would decrease supply estimates of Met, Thr, and Val originatin...Continue Reading

References

Aug 1, 1986·Journal of Animal Science·S H Rahnema, B Theurer
Jan 1, 1974·Journal of Animal Science·W R BurrisJ A Boling
Jan 1, 1973·Journal of Animal Science·P P Williams, W E Dinusson
Jul 1, 1972·Journal of Dairy Science·E A Ibrahim, J R Ingalls
Jan 1, 1995·Journal of Dairy Science·G CozziC E Polan
Apr 1, 1996·The Journal of Nutrition·J P Jouany
Jan 19, 1999·Journal of Dairy Science·J L FirkinsN R St-Pierre
Apr 1, 1999·Journal of Animal Science·J C ElizaldeD B Faulkner
Feb 24, 2001·Journal of Dairy Science·I Strandén, M Lidauer
Aug 25, 2007·Journal of Agricultural and Food Chemistry·Shane M RutherfurdPaul J Moughan
Jul 9, 2008·International Journal of Food Sciences and Nutrition·Shane M RutherfurdColin G Prosser

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Citations

Nov 21, 2017·Journal of Dairy Science·Charles G Schwab, Glen A Broderick
Nov 13, 2018·Annual Review of Animal Biosciences·Sung Woo KimXin Gen Lei
Apr 30, 2019·Journal of Dairy Science·A N HristovZ Yu
Jun 4, 2019·The Journal of Dairy Research·Einar Vargas-Bello-PérezLorenzo E Hernández-Castellano
Sep 16, 2019·Journal of Dairy Science·A J FlemingM D Hanigan
Feb 7, 2020·Animal : an International Journal of Animal Bioscience·H LapierreD R Ouellet
Mar 7, 2020·Animal : an International Journal of Animal Bioscience·M Castillo-UmañaJ P Keim
Mar 19, 2020·Frontiers in Microbiology·Jeffrey L FirkinsJohanna E Plank
Jul 28, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Himani PuniaVirender S Mor
Nov 2, 2019·Journal of Animal Physiology and Animal Nutrition·Isabela P C de CarvalhoJavier Martín-Tereso
Nov 11, 2019·Journal of Dairy Science·A J FlemingM D Hanigan
Dec 10, 2020·Journal of Animal Science and Biotechnology·Virginia L Pszczolkowski, Sebastian I Arriola Apelo
Apr 4, 2021·Journal of Fungi·Thomas Hartinger, Qendrim Zebeli
Aug 8, 2021·Animals : an Open Access Journal From MDPI·Jung-Eun Kim, Hong-Gu Lee
Aug 26, 2021·Translational Animal Science·Tyler J SporeAndrea K Watson
Dec 30, 2021·Journal of Animal Physiology and Animal Nutrition·Nina GresnerKarl-Heinz Südekum

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