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Effects of monensin on volatile fatty acid metabolism in periparturient dairy cows using compartmental analysis
Year:
2009
Source of publication :
Animal Feed Science and Technology
Authors :
אהרוני, יואב
;
.
Volume :
153
Co-Authors:
Markantonatos, X., Department of Dairy and Animal Science, The Pennsylvania State University, 324 William L. Henning Building, University Park, PA 16802, United States
Aharoni, Y., ARO, Newe Yaar Research Center, Israel
Richardson, L.F., Elanco Animal Health, United States
Varga, G.A., Department of Dairy and Animal Science, The Pennsylvania State University, 324 William L. Henning Building, University Park, PA 16802, United States
Facilitators :
From page:
11
To page:
27
(
Total pages:
17
)
Abstract:
Eight multiparous periparturient Holstein cows fitted with ruminal cannulas were used in a split plot design to evaluate effects of monensin on ruminal volatile fatty acid (VFA) metabolism. Diets were supplemented with 300 mg/day of monensin, or no monensin, both prepartum and postpartum. Isotopic tracers, Na-1-13C-acetate (Ac), Na-1-13C-propionate (Pr), or Na-1-13C-butyrate (Bu) were used as markers to describe VFA kinetics in the rumen. The Windows version of SAAM software (WinSAAM) was used to develop a steady state VFA model. A 9-compartment model was adequate to comprehensively describe ruminal VFA metabolism. The main VFA compartments consisted of Ac, Pr and Bu. The model estimated lower Bu and Ac interconversions with monensin, postpartum (Bu to Ac; 0.14 versus 0.12; P=0.04, and Ac to Bu; 0.32 versus 0.25; P=0.11) compared to when measured prepartum. Results demonstrate that dilution studies employing stable isotopes of VFA can be used to provide information on VFA metabolism of the periparturient dairy cow. A time frame of 320 min of labeled VFA infusion employing a single injection allows accurate quantification of VFA metabolism in the rumen. Compartmental kinetic analysis of major VFA in the rumen indicate that monensin reduced about 0.125 the portion of the Ac that contributes to Bu by reducing movements of Bu originated carbons to the Ac pool. Monensin may affect certain biochemical pathways of interconversion of Bu and Ac in the rumen. Propionate kinetic data suggests that Pr behaves as a single pool in the rumen. Monensin did not affect Pr production in the rumen suggesting that monensin improves the metabolic status of the transition cow in a way other than increasing Pr production in the rumen. © 2009 Elsevier B.V. All rights reserved.
Note:
Related Files :
Bos
Compartmental analysis
Kinetics
Monensin
Transition cows
VFA metabolism
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.anifeedsci.2009.05.007
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22245
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:50
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Scientific Publication
Effects of monensin on volatile fatty acid metabolism in periparturient dairy cows using compartmental analysis
153
Markantonatos, X., Department of Dairy and Animal Science, The Pennsylvania State University, 324 William L. Henning Building, University Park, PA 16802, United States
Aharoni, Y., ARO, Newe Yaar Research Center, Israel
Richardson, L.F., Elanco Animal Health, United States
Varga, G.A., Department of Dairy and Animal Science, The Pennsylvania State University, 324 William L. Henning Building, University Park, PA 16802, United States
Effects of monensin on volatile fatty acid metabolism in periparturient dairy cows using compartmental analysis
Eight multiparous periparturient Holstein cows fitted with ruminal cannulas were used in a split plot design to evaluate effects of monensin on ruminal volatile fatty acid (VFA) metabolism. Diets were supplemented with 300 mg/day of monensin, or no monensin, both prepartum and postpartum. Isotopic tracers, Na-1-13C-acetate (Ac), Na-1-13C-propionate (Pr), or Na-1-13C-butyrate (Bu) were used as markers to describe VFA kinetics in the rumen. The Windows version of SAAM software (WinSAAM) was used to develop a steady state VFA model. A 9-compartment model was adequate to comprehensively describe ruminal VFA metabolism. The main VFA compartments consisted of Ac, Pr and Bu. The model estimated lower Bu and Ac interconversions with monensin, postpartum (Bu to Ac; 0.14 versus 0.12; P=0.04, and Ac to Bu; 0.32 versus 0.25; P=0.11) compared to when measured prepartum. Results demonstrate that dilution studies employing stable isotopes of VFA can be used to provide information on VFA metabolism of the periparturient dairy cow. A time frame of 320 min of labeled VFA infusion employing a single injection allows accurate quantification of VFA metabolism in the rumen. Compartmental kinetic analysis of major VFA in the rumen indicate that monensin reduced about 0.125 the portion of the Ac that contributes to Bu by reducing movements of Bu originated carbons to the Ac pool. Monensin may affect certain biochemical pathways of interconversion of Bu and Ac in the rumen. Propionate kinetic data suggests that Pr behaves as a single pool in the rumen. Monensin did not affect Pr production in the rumen suggesting that monensin improves the metabolic status of the transition cow in a way other than increasing Pr production in the rumen. © 2009 Elsevier B.V. All rights reserved.
Scientific Publication
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