Fig. 1.

Cross sectional view of small intestine (jejunal villus) of broiler birds at 28 day of age (H & E X 100). (A): Moderate erosion of the villi tips with loss of villi material and flatten of the upper portion of the villi (T1); (B) Mild erosion with some separation of the tips and separation of the cells from the basement membrane (T2); (C) Moderate erosion of the villi tips with loss of villi material and flatten of the upper portion of the villi (T3), and (D) Moderate erosion of the villi tips with loss of villi material and flatten of the upper portion of the villi (T4).