الفهرس 
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Abstract
In the present study were used: ten healthy mature sheep, ten healthy mature goats, six healthy suckling lambs and six healthy suckling kids of both sexes. The reticular grooves were removed rapidly from the ruminal wall just after the slaughter of the animals.
The specimens for light microscope were immediately fixed in 10% neutral buffered formalin (N.B.F.) and processed by paraffin technique. Sections of 5μm thickness were obtained. The underwent stained by H&E , Silver impregnation technique, Crossmon’s trichrome stain, Van Gieson stain, Orcein stain, Bromo phenol blue stain, AB (pH 2.5) and PAS technique.
Anatomically, The gastric groove is a vital part of digestive system of suckling ruminants. The gastric groove of suckling ruminants acts as a tube transporting milk and other fluids directly from esophagus into abomasum. The gastric groove consisted of two well developed lips and floor between them. The floor of the reticular groove contained longitudinal folds and macroscopical papillae which randomly distributed at the proximal parts and clustered at the entrance of abomasum at level of reticulo-omasal orifice.