Table 1.
Comparison of enteric CH4 emission measurement techniques.
| Method | Indoor/Grazing | CH4/Multi-Gas | Rumen/Hindgut | Continuous/Short-Term | Flux/Concentration |
|---|---|---|---|---|---|
| Respiration chambers | Indoor | CH4, multi-gas | Rumen, hindgut | Continuous | Flux |
| Sulphur hexafluoride tracer | Indoor, grazing | CH4 | Rumen | Continuous | Flux |
| GreenFeed | Indoor, grazing | CH4, multi-gas | Rumen | Short-term | Flux |
| Sniffer method | Indoor | CH4, multi-gas | Rumen | Short-term | Concentration |
| Ventilated hood | Indoor | CH4, multi-gas | Rumen | Continuous | Flux |
| Facemask | Indoor | CH4, multi-gas | Rumen | Short-term | Flux |
| Laser CH4 detector | Indoor, grazing | CH4 | Rumen | Short-term | Concentration |
| Portable accumulation chamber | Indoor | CH4, multi-gas | Rumen, hindgut | Short-term | Concentration |