Table 6.

Effect of dietary treatment and period on jejunum and ileum histomorphology

	Treatmenta				Period				P-value
Itemb	NC	BZA	BC50	AGP	1	2	SEMc	Treatment	Period	Treatment × period
Jejunum
Villus height, µm	478	477	538	502	461	536	37	0.28	0.003	0.20
Crypt depth, µm	227	229	236	213	210	243	18	0.17	<0.001	0.12
VH:CD ratio	2.14	2.09	2.32	2.37	2.24	2.21	0.14	0.29	0.77	0.43
Ileum
Villus height, µm	326	324	354	320	292	369	37	0.20	<0.001	0.22
Crypt depth, µm	211	210	205	189	187	221	7	0.11	<0.001	0.44
VH:CD ratio	1.54	1.57	1.74	1.72	1.58	1.71	0.17	0.20	0.09	0.20

^aPigs were fed experimental diets at weaning (28 d age) for 21 d. Treatments: NC: negative control (no additive); BZA: benzoic acid (0.60%); BC50: Benzocal-50 (0.20%); AGP: antibiotic growth promoter (Carbadox, 50 ppm). Period: period 1 = 7 d; period 2 = 14 d.

^bMaximum value for the standard error of the mean.

^*,†,Means without a common superscript differ after Tukey multiple comparison test, P < 0.05.

Abbreviations: CD: crypt depth; VH: villus height.