Table 2.

Rheological characteristics of ileal digesta from pigs fed experimental diets containing CMC and DDGS^*

Fibre content	MSBM			DDGS			SEM†	P ‡
Viscosity	CEL	MCMC	HCMC	CEL	MCMC	HCMC		F	V	F × V
Whole digesta§
K	5·10	4·71	5·03	4·05	3·52	7·48	1·47	0·95	0·32	0·38
n	0·19b	0·37a	0·39a	0·21b	0·18a,b	0·40a	0·05	0·24	0·003	0·11
Digesta supernatant, mPa·s
Viscosity	1·28c	6·98b	9·24a	1·53c	6·97b	11·25a	1·25	0·48	<0·0001	0·69

a,b,c Mean values within a row with unlike superscript letters were significantly different (P < 0.05).

^*Two basal diets: maize–soyabean meal (MSBM) or MSBM plus 30 % distillers dried grains with solubles (MSBM + DDGS) with three levels of viscosity (i.e. CEL, non-viscous cellulose; MCMC, medium-viscous carboxymethylcellulose; HCMC, high-viscous carboxymethylcellulose).

^†Standard error of the mean.

^‡Factorial arrangement of treatments fibre (F) and viscosity (V) main effects with eighteen and twelve observations, respectively, and fibre and viscosity interaction (F × V) with six observations per treatment.

^§The dynamic whole digesta viscosity was fitted a power-law model according to Holdsworth⁽²³⁾: η = K × γ ⁿ⁻¹, where η is the viscosity, K is the consistency constant, γ is the shear rate and n is the power-law index.