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The study was conducted in 50 clinical cases of non-traumatic primary gastrointestinal tract atony in buffaloes. Higher incidence of disease was found in buffaloes of 4-6 years age and in 2^nd to 3^rd lactation. Complete loss of production was found in all animals affected with gastrointestinal tract atony. Loss of defecation or reduced amount of feaces with or without  melena along with colic signs were the most important clinical findings. The ruminal fluid analysis revealed slight alkaline ruminal fluid pH with watery consistency, weak aromatic odour, delayed methylene blue reduction test and sedimentation floatation test in all affected buffaloes. Medium size protozoa with reduced activity or nil protozoal activities were observed. More gram positive bacteria as compared to gram negative bacteria were observed in ruminal fluid of diseased buffaloes. The findings of present study will be helpful in diagnosis and suggesting therapeutic treatment of the animals affected with gastrointestinal tract atony.

Key words: Buffaloes, Gastrointestinal tract, Atony, Ruminal fluid.