Genetic control of methane emission, feed efficiency and metagenomics in dairy cattle

Abstract

Resumé 1-General introduction 2-Interchangeability between methane measurements in dairy cows assessed by comparing precision and agreement of two non-invasive infrared methods 3-Rapid Communication: Ranking cows' methane emissions under commercial conditions with sniffers versus respiration chambers 4-Can greenhouse gases in breath be used to genetically improve feed efficiency of dairy cows? 5-Host genetics and the rumen microbiome jointly associate with methane emissions in dairy cows 6-General discussion Acknowledgements Curriculum Vitae Colophon General introduction exploration. Geophysics XXV:275-282. Duval, S., and M. Kindermann. 2012. Use of nitrooxy organic molecules in feed for reducing enteric methane emissions in ruminants, and/or to improve ruminant performance.

Genetics of enteric methane emissions of Dutch dairy cows : Climate Envelop project 2019

“…Sniffers do not use an air flux, therefore they cannot measure the exact amount of methane emissions in g/cow/day, but the data can be used to rank cows from low to high emitting. A disadvantage of sniffers is that the precision of measurements can decrease by movement of the head of the cow or background barn gases (Difford, 2018). Studies have shown high correlations (0.77 ± 0.18 and 0.89 ± 0.07) between on-farm sniffers and respiration chamber measurements, demonstrating the potential of using sniffers as an indicator for methane emissions in dairy cattle (Difford, 2018;Garnsworthy et al, 2019).…”

“…A disadvantage of sniffers is that the precision of measurements can decrease by movement of the head of the cow or background barn gases (Difford, 2018). Studies have shown high correlations (0.77 ± 0.18 and 0.89 ± 0.07) between on-farm sniffers and respiration chamber measurements, demonstrating the potential of using sniffers as an indicator for methane emissions in dairy cattle (Difford, 2018;Garnsworthy et al, 2019). Sniffers are cost effective and show potential for use in breeding programs, but still need further validation.…”