Revised methane emissions factors and spatially distributed annual carbon fluxes for global livestock

Table 1 Dairy cow enteric fermentation emissions factor inputs

Region	Based on	Average animal body mass (kg, lactating cows only)		% Stall fed animals		Average milk production (kg/head/year)		Gross energy intake		Digestibility of feed (%)		Y_m (%)
Region	Based on	IPCC 2006^a	This study	IPCC 2006^a	This study	IPCC 2006^a	This study	IPCC 2006^a	This study^a,b	IPCC 2006^a	This study	IPCC 2006^a	This study
US and Canada	US	600	680 [12]	100	93 [12, 39]	8400	9732 [12, 39]	301.7	403.2	75	66.7 [12]	6.5	6 [70]
W. Europe	EU-15	600	624 [71]	100	77 [70]	6000	6935 [71]	275.4	304.9	70	70.2 [70]	6.5	6.53 [70]
E. Eur.–Ctrl. Asia	Russian Fed.	550	572 [4, 71]	100	80 [70]	2550	3898 [70]	232.5	233.9	60	68.6 [70]	6.5	6 [70]
Oceania	Australia	500	565 [70]	0	7 [70]	2190	5789 [70]	234.6	253	60	76.1 [70]	6.5	7.24 [70]
Latin America	Brazil	400	458 [72]	0	2 [73]	800	1208 [74]	179.3	207.1	60	60^c	6.5	8 [74]
E.-S.E. Asia	China	350	500 [59, 75]	100	100 [58, 59, 76]	1650	3011 [36]	160.9	333.7	60	60^c	6.5	7 [76]
Africa	Ethiopia	275	354.75^d	100	50 [77]	475	687.2 [36, 77]	107.3	147.2	60	60^c	6.5	8^e
S. Asia	India	275	281 [78, 79]	100	70 [77]	900	1355.2 [36, 77]	135.4	160.2	55	55^c	6.5	8^e

Only lactating dairy cows are included in the dairy cow category. Reported values that included dairy calves, heifers, dry cows, and/or replacements were not used or were adjusted to reflect producing dairy cow populations
^aCalculated using information in supplemental tables in Chapter 10 of IPCC 2006 [4]
^bNet energy for growth and wool production are assumed to be zero for mature dairy cows
^cUnchanged from information in supplemental tables in Chapter 10 of IPCC 2006 [4] due to lack of newer information
^dBased on average increases found for Latin America and E.-S.E. Asia, due to lack of information
^eAs reported for Latin America, due to lack of information