Table 3.

Effects of ADY on rumen fermentation of weaned beef calves¹.

Item	Treatments		SEM	P-value
	CON	ADY
pH	6.54	6.61	0.053	0.524
Ammonia-N, mg/dL	9.48	8.64	0.189	0.023
MCP, mg/mL	2.27	2.51	0.058	0.036
Acetate, mmol/L	56.58	54.55	0.829	0.229
Propionate, mmol/L	14.30	15.46	0.269	0.029
Butyrate, mmol/L	8.30	9.35	0.177	0.002
Total VFA, mmol/L	83.04	84.06	0.980	0.611
Acetate-to-propionate ratio	4.00	3.55	0.098	0.020
Molar proportion, %
Acetate	68.04	64.94	0.522	0.002
Propionate	17.29	18.40	0.326	0.089
Butyrate	10.02	11.14	0.211	0.006

ADY = active dry yeast; SEM = standard error of mean; MCP = microbial protein; VFA = volatile fatty acids.

¹CON, control with no ADY and fed basal ration; ADY, fed basal ration and 5 g/d ADY (Angel Yeast Co., Ltd., Yichang, Hubei, China) per calf.