Table 3
Treatment effects on ruminal pH, VFA molar proportions and BUN

	Urea fermentation potential			P –value
Item	0	0.6	1.2	Linear	Quadratic	SEM
Ruminal pH	5.75	5.86	5.84	0.51	0.59	0.10
Ruminal N-NH (mg/dL)	5.37	4.69	3.89	0.05	0.91	0.56
Total VFA (mM)	95.9	105	94.2	0.83	0.21	5.4
Ruminal VFA (mol/100 mol)
Acetate	46.8	49.2	57.5	0.08	0.54	4.6
Propionate	36.1	30.1	20.3	0.04	0.74	5.7
Isobutyrate	1.19	1.17	0.89	0.30	0.60	0.23
Butyrate	12.0	15.1	17.7	0.17	0.93	3.1
Isovalerate	1.53	1.77	0.83	0.19	0.20	0.41
Valerate	2.36	2.63	2.83	0.42	0.95	0.48
Acetate:propionate	1.34	1.85	2.94	0.05	0.63	0.59
Methane1	0.35	0.44	0.60	0.04	0.70	0.09
BUN (mg/dL)	4.43	2.80	1.45	<0.01	0.53	0.25