Abstract
In a sample of twenty adult horses' stomachs, the mucosal surface pH was measured at 14 different loci, immediately post mortem, using a pH probe. The squamous epithelium of the pars oesophagea was observed to show a lower pH than the glandular mucosa. The pH of the glandular mucosa was generally uniform whereas within the pars oesophagea the different loci were observed to show variation, the lowest readings being found where the squamous epithelium adjoins the margo plicatus, the same area where ulceration initially tends to occur. Ten horses in the sample showed moderate to severe ulceration and these horses had significantly lower pH readings compared to the group with mild to no ulceration.
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