Table 5.

Daily methane production of heifers receiving corn stalk-based diets with or without 150 mg/d of monensin fed at a maintenance level of intake

Item	Day of study						SEMb	Probabilitya
	0	3	14	28	42	161		Treatment	Day
CH4, L/d
Control	134.4a	160.8b,c	169.8c	158.3b	161.6b,c	185.8d	7.61	0.40	<0.01
Monensin	136.3a	148.8b,c	159.3c	146.8b	163.7b,c	187.3d	7.17
CH4, L/kg of DMI
Control	26.0a,c	29.2b	28.2a,d	26.4a,c	30.5b,d	22.62c	1.72	0.51	<0.01
Monensin	23.5a,c	32.5b	26.7a,d	23.4a,c	29.4b,d	23.3c	1.72
CH4, L/kg BW0.75
Control	1.3a	1.6b	1.7b	1.5b	1.6b	1.7b	0.07	0.03	<0.01
Monensin	1.3a	1.4b	1.5b	1.4b	1.5b	1.6b	0.06

^aNo treatment × day interactions present (P ≥ 0.69).

^bPooled SE of least squares means (control n = 7; monensin n = 8).

^a,b,cWithin a row, means across days without a common superscript differ (P ≤ 0.05).