Table 7.

Effect of dietary inputs and production parameters on methane production in the beef cattle value chain*

	Dietary input†
	Peters		Current
Item	PDPP	PDCP	CDPP	CDCP
Cow–calf
Methane, kg/herd	114,118	128,431	129,201	127,048
Methane, kg/kg of HePp	3.49	4.28	3.96	4.53
CO2 equivalents/kg of HePp	87.35	123.80	108.26	127.67
Stocker
Methane, kg/herd	13,498	12,326	13,446	10,085
Methane/kg of HePp	1.85	1.59	1.84	1.89
CO2 equivalents/kg of HePp	46.22	39.70	46.05	47.32
Feedlot
Methane, kg/herd	14,652	17,045	15,057	16,946
Methane, kg/kg of HePp	0.97	0.89	1.00	0.94
CO2 equivalents/kg of HePp	24.27	22.19	24.94	23.55
Beef value chain
Methane, kg/herd	142,268	157,802	157,704	154,079
Methane, kg/kg of HePp	2.58	2.86	2.86	3.05
CO2 equivalents/kg of HePp	64.60	80.83	77.17	84.38

PDPP = previous model diets and production parameters; CDPP = current industry diet, previous model production parameters; PDCP = previous model diet, current industry production parameters; CDCP = current industry diets and production parameters.

*Results are estimated for a 1,000 cow herd.

^†Peters = diets from Peters et al. (2014); Current = current diets fed in the industry.