The effect of nutritional strategy on methane emissions, milk yield and fatty acid profiles in Holstein Friesian dairy cows
Methane (CH4) emissions are a product of the enteric fermentation of ruminants. Individual dairy cows vary in the quantity of CH4 they produce with estimates ranging from 278 to 456g CH4/d (Garnsworthy et al., 2012) and this can be linked to feed intake and diet digestibility. Quantifying CH4 production from individual animals can be time consuming and costly using methods such as respiration chambers or SF6. CH4 emissions have been associated with milk composition (Dehareng et al., 2012) and enteric emissions are linked to milk mid-infrared spectrometry based on the synthesis of CH4 having a relationship to butterfat, and lactose production (Vlaeminck and Fievez, 2005). Non-intrusive estimates of enteric CH4 can be obtained using a laser methane detector (LMD) and results can be approximated with closed chamber measurements. The aim of this study was to compare the effect of two diets (50% and 100% grazed grass) on CH4 emissions from dairy cows and to test associations between LMD measurements and fatty acid profiles.
Other Titles/Title of Conference
BSAS Annual Conference 2018, Dublin, Ireland