Table 4. The ruminal pH, NH₃N, and volatile fatty acid proportions for goats supplemented with control, LGY, MGY and HGY¹.

	Treatments					Contrast, P
Item	Control	LGY	MGY	HGY	SE	Treatment	Linear	Quadratic
pH	6.67a	6.63a	6.58b	6.52c	0.02	<0.05	<0.05	0.63
NH3N, mg/dL	10.28a	10.10ab	9.78b	9.34c	0.13	<0.05	<0.05	0.14
Total VFA, mmol/L	72.31b	73.33ab	76.01a	76.94a	1.41	<0.05	<0.05	0.97
Mol/100 mol
Acetate(A)	64.25	63.13	63.63	64.66	1.05	0.48	0.60	0.15
Propionate(P)	18.84b	19.44b	19.88ab	21.47a	0.77	<0.05	<0.05	0.36
Butyrate	9.82	9.73	10.69	10.11	0.52	0.25	0.27	0.49
A:P	3.45	3.30	3.29	3.13	0.15	0.19	0.05	0.98

¹LGY, MGY and HGY  =  glycerol-enriched yeast culture at 100, 200 and 300 mL per goat per day, respectively.

^abcMeans within a row with different superscripts differ (P<0.05).