Both aspects often give rise to indoor emission intakes of up to several orders of magnitude higher than outdoor emission intakes (4− 6).
Those fed at maintenance are theoretically estimating CH4 emission per live weight as much as CH4 emission per unit intake; CH4 emissions increases with live weight, and thus the ratio measure could be similar across time points in maintenance fed studies.
This study evaluated the effect of 4 levels of dietary nitrate addition on enteric methane production, hydrogen emission, feed intake, rumen fermentation, nutrient digestibility, microbial protein synthesis, and blood methemoglobin.
The objective of this study was to examine the effect of replacing conventional corn silage (CCS) with brown midrib corn silage (BMCS) in dairy cow diets on enteric CH4 emission, nutrient intake, digestibility, ruminal fermentation characteristics, milk production, and N excretion.
The assessment of indoor exposure needs to be facilitated by including emission factors, intake fractions and human-toxicological effect factors for indoor air sources into existing LCA software tools and databases.
Our results suggest that simply dividing emissions by feed intake in the RC can result in a negative phenotypic correlation with feed intake.
Finally, at the animal level, individual CH4 emissions and feed intake measurements to enable genetic progress on CH4 yield (MY; g CH4/kg dry matter intake (DMI)), or residual feed intake (RFI; MJ/day), which is the difference between net energy intake and calculated energy requirements for maintenance as a function of live weight and for fat and protein corrected milk yield.
The present study aimed to evaluate the effect of ryegrass pasture combined with a partial TMR on enteric methane emissions, dry matter intake (DMI), and performance of dairy cows from mid to late lactation.
Here we examine sire variation and phenotypic relationships for RC measurements of methane emissions and feed intake of sheep habituated to a diet of lucerne and oaten chaff, fed at a restricted rate of 20 g/kg liveweight (LW).
Instead of multiplying the emissions to the intake fractions, as usually done in LCA, the amounts taken in by the people exposed would be directly calculated from the monitored concentrations and the number and inhalation rates of people.
