Individual variation and repeatability of methane production from dairy cows estimated by the CO2 method in automatic milking system
作者： M.N. Haque , C. Cornou , J. Madsen
DOI: 10.1017/S1751731115000646
关键词:
摘要: The objectives of this study were to investigate the individual variation, repeatability and correlation methane (CH4) production from dairy cows measured during 2 different years. A total 21 with an average BW 619±14.2 kg milk 29.1±6.5 kg/day (mean±s.d.) used in 1st year. During 2nd year, same 640±8.0 33.4±6.0 (mean±s.d.). housed a loose housing system fitted automatic milking (AMS). mixed ration was fed ad libitum both In addition, they offered concentrate AMS based on their daily yield. CH4 CO2 levels analysed using Gasmet DX-4030. estimated dry matter intake (EDMI) 19.8±0.96 23.1±0.78 (mean±s.d.), energy-corrected (ECM) 30.8±8.03 33.7±5.25 respectively. EDMI ECM had significant influence (P<0.001) (l/day) yield significantly higher (P<0.05) year compared (described by ECM) appeared be key factor variation release. (r=0.54) observed between strongly correlated (r=0.70) years adjusted (30 kg/day). diurnal (l/h) showed lower emission night (0000 0800 h). between-cows (l/day, l/kg within-cow for 0.51 conclusion, (kg/day) followed variations among than variations. highly repeatable and, production,
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