Photomicrographs displayed the histopathological variations of rumen tissue sections between examined groups as follows: (a, b, c) Control Group demonstrated the standard histological structure of tunica mucosa (rectangle) in its stratified squamous keratinized epithelium (arrow) and propria sub mucosal layer (arrowhead). (d, e, f) Doss Group: revealed hyperplasia of the lining epithelium (rectangle), inflammatory cells (arrow), increase in fibrous amount (arrowhead), as well as interstitial edema (star). (g, h, i) SLS Group: highlighted hyperkeratosis along with hyperplasia in the lining epithelium (rectangle), inflammatory cells (arrow) and increase in the fiber amount (arrowhead). (H&E, Magnification power: x100, x200, x400, respectively).