ウシの第4胃変位およびアトニーの発生要因に関する臨床ならびに病理学的研究 : II. 実験例

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  • Clinical and pathological studies on the etiological factors of bovine abomasal displacement and atony, Experimental cases.
  • ウシの第4胃変位およびアトニーの発生要因に関する臨床ならびに病理学的研究-2-実験例〔英文〕
  • ウシ ノ ダイ4イ ヘンイ オヨビ アトニー ノ ハッセイ ヨウイン ニ カン

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In the previous paper, it was suggested that forestomach disorders might act as precursors of abomasal displacement and atony, and that as one of the etiological factors of forestomach disorders, the presence of a sharp foreign body in the reticulum might have significant meaning. In this paper, therefore, traumatic reticulitis was induced experimentalIy in two bullocks to study the significant effect of a sharp metallic foreign body in the reticulum mainly fluoroscopically and histopathologically. Fluoroscopy: Immediately after the ingestion of pieces of wire and their implantation in the reticular plexus just below the cardia, sustained tonic contraction (tonus) was observed in the reticulum. Reticular tonus waned on the 7th day, but reticular atony supervened simuItaneously. Bloat was observed on the 8th day in both cases. Tonus was observed in the abomasum immediately after implantation of wire in the reticular plexus just below the cardia. Abomasal tonus waned on the 5th and 6th days, but abomasal atony supervened simultaneousIy. The abomasal posterior edge further extended gradually backwards. Histopathological examination: The general feature was found the presence of relatively fresh degenerative lesions in the smooth muscle and intramural nerve fibers of the reticulum, amasum and abomasum. From the results of this study, it can be considered that the direct consequential effect of a sharp foreign body in the reticulum is one of the etiological factors of abomasal atony and forestomach disorders.

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