Table 3.

Changes in duodenal morphometric parameters following short term exposure to bacitracin methylene disalicylate

	Unit	N	LSMean	SEM	P value
Villus height					0.049
BMDa	µm	16	2018.6x	49.5
ABF	µm	16	2162.8y	49.5
Crypt depth					0.746
BMD	µm	16	384.8	15.3
ABF	µm	16	391.9	15.3
Ratio					0.339
BMD	µm/µm	16	5.6	0.2
ABF	µm/µm	16	6.0	0.2
Muscularis thickness					0.348
BMD	µm	16	193.6	8.7
ABF	µm	16	205.3	8.7
Total thickness					0.130
BMD	µm	16	2498.4	70.2
ABF	µm	16	2653.1	70.2

BMD broilers that received feed with 50 g/ton of bacitracin methylene disalicylate beginning at 31 days post hatch, ABF treatment group where broilers received no bacitracin methylene disalicylate; Ratio, villus height to crypt depth ratio; Total thickness, villus height + crypt depth + muscularis depth

^aData were similar for day and the interaction of day and BMD treatment; therefore, data shown are for differences in BMD dietary treatment where data from day 3 and 7 are combined

^xyzchanges in superscript within row indicate differences between pairwise comparisons after Tukey’s post hoc adjustment (P < 0.05)