In Holland starts Wageningen University & Research a research project with analysing the breath of cows as an indicator of the health of individual cows, also in relation to milk production. For this has been installed the first sniffer on the first of 100 dairy farm with more than 10000 cows on which methane and CO2 concentrations will be recorded over the next two years. All measurements take place in the milking robot, which enables information to be collected on each cow individually during milking. The collected data that will form the basis for developing a new breeding value for methane. Previous research based on measurements at 15 farms has shown that there is an important genetic component to this. First analysis show heritability for methane emissions of 20 to 30 percent.