TABLE 1.

pH and acetate concentration in rumen samples before and after incubation with E. coli O157:H7

Dieta	Mean acetate concn ± SDb (mM) and pH from indicated sample
	WOF				WF
	Before incubation		After a 24-h incubation		Before incubation		After a 24-h incubation
	Acetate	pH	Acetate	pH	Acetate	pH	Acetate	pH
H	38.1 ± 2	7.1	40.3 ± 1.1	6.8	38.1 ± 2	7.1	55.3 ± 0.4	6.5
HW0	43.3 ± 7	6.9	45.7 ± 7.8	5.6	43.3 ± 7	6.9	81.4 ± 6.1	5.7
HW3	65.7 ± 0.9	5.9	66.0 ± 1.4	5.1	65.7 ± 0.9	5.9	103.0 ± 0.5	4.8

^aRumen samples were obtained from sheep fed hay or from sheep fed hay plus wheat before the morning feeding or 3 h after the morning feeding.

^bFrom three independent cultures.