Methane emissions of differently fed dairy cows and corresponding methane and nitrogen emissions from their manure during storage.

摘要: This study investigated the effects of supplementing 40 g lauric acid (C12) kg-1 dry matter (DM) in feed on methane emissions from early-lactating dairy cows and associated methane, nitrous oxide ammonia release manure during storage. Stearic (C18), a fatty without assumed methane-suppressing potential digestive tract ruminants, was added at DM to control diet. The complete consisted forage concentrate ratio 1.5:1 (DM basis). stored for 14 weeks either as slurry or, separately, urine-rich farmyard representing two common storage systems. Methane cows, measured respiratory chambers, lower with C12 by about 20%, but this mostly resulting reduced intake and, partly, rate fibre digestion. As milk yield declined less than intake, emission per kg significantly (11.4 g) C18 (14.0 g). Faeces C12-fed had higher proportion undigested accordingly their compared obtained C18-fed cows. Overall, manure-derived accounted for8.2% 15.4% total after 7 storage, respectively. evolution widely differed between types dietary treatments, retarded onset particularly treatment. Emissions were manures partially compensated respect greenhouse gas potential. (cow together) 8.7 10.5 equivalents CO2 cow-1 d-1with C18, At unaffected urine-N nitrogen losses corresponding differences intake. present results suggest that contributes husbandry, identification effective mitigation strategies has consider both animals manure.