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Simulating the number of spot-samples required to estimate the methane to carbon dioxide ratio in lambs and its relationship with methane yield.
- Source :
-
New Zealand Journal of Agricultural Research . Jun2024, Vol. 67 Issue 3, p303-313. 11p. - Publication Year :
- 2024
-
Abstract
- Measuring the methane to carbon dioxide ratio (CH4/CO2) from animals could be useful to predict CH4 yield when dry matter intake (DMI) cannot be measured. The objectives were to (1) evaluate the relationship of CH4/CO2 with CH4 yield; (2) compare the CH4/CO2 of 10–60 simulated spot-samples with the CH4/CO2 calculated with data from 48-h of respiration chamber measurements. The DMI and CH4 and CO2 emissions measured every 5–6 min in respiration chambers from a previous experiment with 70 lambs fed ryegrass substituted with 0%, 25%, 50%, 75% and 100% of forage rape were retrieved. Emission data were used to perform simulations of 10, 20, 30, 40, 50 and 60 randomly selected spot-samples per lamb. The CH4/CO2 of 20 or more spot-samples was useful to predict CH4 yield and detect differences between dietary treatments, while the precision of the prediction increased when increasing the number of spot-samples up to 50 samples per lamb. Twenty spot-samples were sufficient to obtain accurate CH4/CO2 estimates; however, variance decreased (precision improved) with an increasing number of spot-samples per lamb up to 50 spot-samples. The CH4/CO2 of 10–60 simulated spot-samples explained 61% to 66% of variation in the 48-h measured CH4 yield. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CARBON dioxide
*LAMBS
*METHANE
*RESPIRATORY measurements
*RYEGRASSES
*RAPESEED oil
Subjects
Details
- Language :
- English
- ISSN :
- 00288233
- Volume :
- 67
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- New Zealand Journal of Agricultural Research
- Publication Type :
- Academic Journal
- Accession number :
- 177318741
- Full Text :
- https://doi.org/10.1080/00288233.2023.2248937