![]() Physical changes in the intestine of birds given either antibiotic growth promoter, although not the same, resulted in improved performance. Chicks supplemented with VM had a smaller total villus area and shorter villus height and crypt depth in the ileum than birds fed the control diet or BMD. In the ileum, the muscularis mucosa was thinner in birds given VM than in those fed the control diet. The only change found in the duodenum resulting from dietary treatment was an increase in the number of villi per unit length in birds given VM but not BMD or control. However, intestinal length and weight decreases were greater in birds fed VM than BMD at 1 and 3 wk of age. Feeding either antibiotic increased BW and decreased intestinal length and weight at all times compared with control birds. However, biocontrol agents need not attack nontarget organisms to exhibit nontarget effects (McEvoy 1996, Secord and Kareiva 1996, Simberloff and Stiling 1996a, b, Callaway et al. Male and female birds were killed at 1, 3, 5, or 7 wk of age for gross and histologic examination of the duodenum and ileum. The effects of addition of bacitracin methylene disalicylate (BMD) or virginiamycin (VM) to a corn-soybean meal diet on broiler performance and gastrointestinal tract (GIT) growth parameters and morphology were studied at various ages during growth and finishing.
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