Rumen collapse or rumen void is a syndrome usually observed in cattle affected with other primary diseases. It is a sequelae to other primary diseases due to total anorexia for several days. Recently purchased and calved animals brought into Large Animal Outpatient Medicine Unit, Madras Veterinary College Teaching Hospital, with the history of prolonged anorexia, mastitis and metritis were screened for rumen collapse. A total of 20 cases were included for the study. Animals were subjected to

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... nical, physical, rectal, haematological and biochemical examination. Anamnesis included were anorexia in all cases, high rise of temperature 15(75%) and high coloured urine 14(70%). An rumen collapsed in case of recently purchased animals were 12(60%). Clinical signs were anemia 18(90%), enlarged lymph node 17(85%), decreased rumen motility 17(85%), decreased or suspended rumination 16(80%). Rectal examination revealed a small sized rumen (rumen collapsed). Rumen fluid examination revealedvery few live protozoa or complete absence of protozoal motility and increased in MBRT (Methylene blue reduction test) time. The haematological examination revealed reduced level of Hb, PCV and RBC level. Biochemical examination revealed reduced level of total protein and other parameters were remain in the normal range. The suggestive of the primary diseases involved were hypocalcaemia, theileriosis, anaplasmosis, mastitis, septic metritis, indigestion and babesiosis. The animals were firstly treated for primary diseases followed by rumen cud transplantation and oral administration of rumenotorics bolus.