Table 4. The effect of dietary APOS supplementation and/or RV challenge on bacteria, pH value and concentrations of volatile fatty acids (VFA) in the cecal digesta of weaned pigs (n=7).

	RV -		RV +		P-value
	CON	POS	CON	POS	POS	RV	POS×RV
Bacterium populations (log10(copies/g))
Lactobacillus	8.16±0.02C	8.48±0.01A	8.02±0.02D	8.30±0.02B	<0.05	<0.05	0.19
Bifidobacterium	3.14±0.03C	4.10±0.04A	2.38±0.03D	3.50±0.04B	<0.05	<0.05	<0.05
E. coli	7.91±0.04C	7.73±0.03D	8.35±0.02A	8.18±0.03B	<0.05	<0.05	0.99
Total bacteria	11.81±0.06C	11.96±0.03B	11.87±0.02BC	12.08±0.02A	<0.05	<0.05	0.45
pH value	5.61±0.05B	5.49±0.02B	6.06±0.06A	5.62±0.02B	<0.05	<0.05	<0.05
VFA concentrations (mg/g)
Acetate	3.98±0.29B	5.19±0.29A	3.68±0.26C	3.83±0.24B	<0.05	<0.05	0.43
Propionate	2.08±0.19	2.59±0.18	2.00±0.16	2.16±0.15	0.14	0.06	0.31
Butyrate	0.72±0.09	0.83±0.09	0.60±0.08	0.76±0.07	0.13	0.31	0.78
Total VFA	6.79±0.49B	8.62±0.49A	6.29±0.45C	6.62±0.41B	<0.05	<0.05	0.12

^# RV -, infusing the essential medium; RV +, infusing the porcine rotavirus; CON, basal diet; POS, POS-supplemented diet.

^{A, B, C, D} In the same row, values with different letter superscripts mean significant difference (P<0.05).