In Vitro Incubations Do Not Reflect In Vivo Differences Based on Ranking of Low and High Methane Emitters in Dairy Cows
Abstract
:Simple Summary
Abstract
1. Introduction
2. Materials and Methods
2.1. Animal Data
2.2. In Vivo CH4 Production and Animal Ranking for Low and High Emitters
2.3. In Vitro Incubations and Laboratory Procedures
2.4. Analyses of Rumen Microbiome
2.4.1. DNA Extraction
2.4.2. 16S rRNA Data Analysis
2.5. Statistical Analysis
3. Results
3.1. In Vivo Measurements
3.2. Total Gas and CH4 Production In Vitro
3.3. Rumen Fermentation
3.4. Analysis of Microbial Composition
3.4.1. Bacteria
3.4.2. Archaea
3.5. Differences in Microbial Community Structure between Low and High Emitters
4. Discussion
4.1. GreenFeed vs. In Vitro Gas Measurements
4.2. Rumen Microbiome and CH4 Production
4.2.1. Bacteria
4.2.2. Archaea
4.2.3. Alternative H+ Sinks
4.3. Animal-Related Factors
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Item 1 | Grass Silage | Barley |
---|---|---|
OM | 940 | 972 |
CP | 144 | 123 |
NDF | 573 | 220 |
Item 1 | Low | High | s.e.m. 2 | p-Value 3 |
---|---|---|---|---|
DMI kg/d | 20.4 | 20.8 | 0.78 | 0.71 |
ECM kg/d | 23.0 | 25.9 | 1.68 | 0.24 |
BW kg | 596 | 644 | 30.4 | 0.28 |
CH4 g/d | 331 | 442 | 19.6 | <0.01 |
CH4/DMI kg/kg | 16.7 | 21.5 | 130 | 0.02 |
Residual CH4 g/d | −44.5 | 46.1 | 18.0 | <0.01 |
Item 1 | Low | High | s.e.m. 2 | p-Value 3 |
---|---|---|---|---|
Total VFA concentration (mmol/L) | 46.7 | 50.4 | 4.65 | 0.60 |
VFA proportion (mmol/mol) | ||||
Acetate | 677 | 688 | 9.77 | 0.57 |
Propionate | 156 | 158 | 4.92 | 0.78 |
Butyrate | 132 | 138 | 9.24 | 0.65 |
Isobutyrate | 10.7 | 10.9 | 0.64 | 0.83 |
Valerate | 13.8 | 13.3 | 0.93 | 0.71 |
Isovalerate | 5.47 | 4.94 | 0.42 | 0.40 |
Caproate | 5.54 | 6.38 | 0.74 | 0.48 |
CH4VFA (moles/mol VFA) | 379 | 377 | 3.97 | 0.78 |
pH | 6.82 | 6.73 | 0.056 | 0.27 |
Item | In Vivo | Diet 1 | CNSL 2 | s.e.m. 3 | p-Value | Interactions 4 | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Emitter | S | SB | Without | With | Emitter | Diet | CNSL | E × D | E × C | D × C | ||
Asymptotic total gas prod. (mL/ g of DM) | Low | 220 | 266 | 273 | 213 | 11.5 | 0.75 | <0.01 | <0.01 | 0.89 | 0.62 | 0.85 |
High | 221 | 268 | 272 | 217 | ||||||||
Predicted gas at 48 h | Low | 158 | 218 | 214 | 162 | 7.40 | 0.70 | <0.01 | <0.01 | 0.95 | 0.61 | 0.55 |
(mL/ g of DM) | High | 156 | 217 | 209 | 163 | |||||||
Rate of total gas prod. | Low | 0.047 | 0.075 | 0.064 | 0.058 | 0.0042 | 0.34 | <0.01 | 0.01 | 0.73 | 0.79 | 0.48 |
(/h) | High | 0.045 | 0.072 | 0.061 | 0.056 | |||||||
Asymptotic CH4 prod. | Low | 22.4 | 28.4 | 36.1 | 15.0 | 2.97 | 0.76 | <0.01 | <0.01 | 0.50 | 0.89 | <0.01 |
(mL/ g of DM) | High | 22.1 | 29.4 | 36.5 | 15.0 | |||||||
Predicted in vivo CH4 at 48 h 5 | Low | 16.1 | 21.4 | 26.6 | 10.9 | 2.16 | 0.68 | <0.01 | <0.01 | 0.55 | 0.98 | <0.01 |
(mL/ g DM) | High | 16.0 | 22.1 | 26.9 | 11.3 | |||||||
Rate of CH4 (/h) | Low | 0.047 | 0.056 | 0.049 | 0.053 | 0.003 | 0.05 | <0.01 | 0.01 | 0.95 | 0.03 | <0.01 |
High | 0.050 | 0.058 | 0.049 | 0.058 | ||||||||
CH4 / total gas at 48 h | Low | 0.099 | 0.107 | 0.126 | 0.080 | 0.0167 | 0.38 | 0.52 | <0.01 | 0.81 | 0.26 | 0.94 |
High | 0.093 | 0.097 | 0.128 | 0.062 |
Item | In Vivo | Diet 1 | CNSL 2 | s.e.m 3 | p-Value | Interactions 4 | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Emitter | S | SB | Without | With | Emitter | Diet | CNSL | E × D | E × C | D × C | ||
Total VFA concentration 4 | Low | 67.5 | 63.0 | 65.8 | 64.7 | 4.14 | 0.26 | 0.13 | <0.01 | <0.01 | 0.01 | 0.14 |
(mmol/L) | High | 56.4 | 68.4 | 69.2 | 55.7 | |||||||
VFA prop. (mmol/mol) | ||||||||||||
Acetate | Low | 589 | 541 | 591 | 540 | 13.7 | 0.06 | <0.01 | <0.01 | 0.32 | <0.01 | 0.03 |
High | 567 | 534 | 598 | 503 | ||||||||
Propionate | Low | 266 | 293 | 245 | 314 | 16.4 | <0.01 | <0.01 | <0.01 | 0.89 | <0.01 | <0.01 |
High | 286 | 315 | 246 | 355 | ||||||||
Butyrate | Low | 85.6 | 109 | 102 | 92.1 | 4.74 | 0.09 | <0.01 | <0.01 | 0.04 | 0.94 | 0.09 |
High | 86.6 | 98.7 | 97.5 | 87.8 | ||||||||
Isobutyrate | Low | 13.8 | 13.4 | 13.5 | 13.7 | 0.40 | 0.64 | <0.01 | 0.03 | 0.16 | 0.13 | 0.01 |
High | 14.1 | 12.9 | 13.0 | 14.0 | ||||||||
Valerate | Low | 25.2 | 26.0 | 27.2 | 24.0 | 2.24 | 0.10 | 0.16 | 0.01 | 0.02 | 0.33 | 0.99 |
High | 25.8 | 22.5 | 24.9 | 23.4 | ||||||||
Isovalerate | Low | 11.0 | 11.1 | 11.4 | 10.7 | 0.54 | 0.86 | <0.01 | 0.93 | <0.01 | 0.01 | 0.01 |
High | 11.9 | 10.2 | 10.7 | 11.4 | ||||||||
Caproate | Low | 9.05 | 6.87 | 10.7 | 5.18 | 2.39 | 0.37 | 0.02 | <0.01 | 0.98 | 0.35 | 0.03 |
High | 8.23 | 6.09 | 9.11 | 5.21 | ||||||||
CH4VFA (moles/mol VFA) 5 | Low | 288 | 267 | 304 | 251 | 12.4 | <0.01 | <0.01 | <0.01 | 0.99 | <0.01 | <0.01 |
High | 272 | 251 | 304 | 219 | ||||||||
pH | Low | 6.33 | 6.42 | 6.36 | 6.46 | 0.021 | 0.02 | <0.01 | <0.01 | 0.51 | 0.84 | 0.46 |
High | 6.44 | 6.31 | 6.48 | 6.34 |
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Cabezas-Garcia, E.H.; Danielsson, R.; Ramin, M.; Huhtanen, P. In Vitro Incubations Do Not Reflect In Vivo Differences Based on Ranking of Low and High Methane Emitters in Dairy Cows. Animals 2021, 11, 3112. https://doi.org/10.3390/ani11113112
Cabezas-Garcia EH, Danielsson R, Ramin M, Huhtanen P. In Vitro Incubations Do Not Reflect In Vivo Differences Based on Ranking of Low and High Methane Emitters in Dairy Cows. Animals. 2021; 11(11):3112. https://doi.org/10.3390/ani11113112
Chicago/Turabian StyleCabezas-Garcia, Edward H., Rebecca Danielsson, Mohammad Ramin, and Pekka Huhtanen. 2021. "In Vitro Incubations Do Not Reflect In Vivo Differences Based on Ranking of Low and High Methane Emitters in Dairy Cows" Animals 11, no. 11: 3112. https://doi.org/10.3390/ani11113112