Table 4.

Milk yield and dry matter intake of dairy cows in three phases of fitting with sulfur hexafluoride (SF₆) equipment.

	PRE	MEAS	POST	SEM	P-value
Milk yield (kg/day)	32.2	32.2	31.0	1.28	0.44
Dry matter intake (kg dry matter/d)	29.2a	23.0b	26.0ab	1.74	<0.01

^a−bMeans within a row with different superscript letters differ (P < 0.05).

SEM, standard error of the mean; PRE, before the cows had the equipment on; MEAS, during the enteric methane measurements; POST, after the SF₆ equipment was removed.