Table 4.

Effects of corn resistant starch on the relative length and weight of small intestine of 21-day-old broilers

Items	Treatments1)					SEM	p-value
	NC	CS	4% RS	8% RS	12% RS		ANOVA	Linear2)	Quadratic2)
Duodenum (cm/kg BW)	35.68d	41.67c	43.91bc	45.79ab	47.57a	0.66	<0.001	<0.001	0.822
Jejunum (cm/kg BW)	78.15b	108.85a	110.29a	113.55a	121.95a	3.19	<0.001	0.126	0.592
Ileum (cm/kg BW)	73.81b	108.85a	110.38a	112.73a	121.96a	3.40	<0.001	0.155	0.579
Duodenum (g/kg BW)	6.88b	6.87b	6.51b	8.10a	8.50a	0.16	<0.001	<0.001	0.196
Jejunum (g/kg BW)	16.23b	17.94ab	18.23a	19.83a	19.04a	0.75	0.002	0.108	0.293
Ileum (g/kg BW)	12.23	12.45	12.97	13.03	14.55	1.33	0.178	0.068	0.511

Results are represented as the mean value±SEM (n = 8).

SEM, standard error of the mean; ANOVA, analysis of variance; BW, body weight.

¹⁾NC, a basic normal corn–soybean diet; CS, a corn–soybean–based diet supplementation with 20% corn starch (CS); 4% RS, 8% RS, and 12% RS, the corn–soybean–based diets supplementation with 4%, 8%, and 12% corn resistant starch (RS), respectively.

²⁾Orthogonal polynomial contrast was used to determine linear and quadratic effects of increasing concentrations of resistant starch in CS and RS diets.

^a–dMeans in a row without a common superscript letter significantly differ (p<0.05).