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Failure of chemoprophylaxis against bovine trypanosomiasis on Galana Ranch in Kenya.

Abstract
The duration of prophylaxis provided by 1 mg kg-1 bodyweight of homidium bromide was compared with that provided by 1 mg kg-1 bodyweight of isometamidium chloride in a 12 month field trial involving 90 Boran cattle exposed to trypanosome challenge on Galana Ranch in Kenya. Weekly trypanosome prevalences of over 30% were observed during 4 of the 12 months. During these periods of heavy challenge, parasites were detected 2-3 weeks after administration of both homidium bromide and isometamidium chloride. Both prophylactic drugs were administered, on a group basis, eight times over the 12 month trial and in addition individual infections were also treated with diminazene aceturate. Isometamidium chloride provided slightly longer periods of prophylaxis than homidium bromide, 28.4 days compared with 25.4 days. There was a highly significant difference in the productivity of the two groups during a period of poor grazing. 27% of the isometamidium chloride herd died from a severe wasting condition with substantial liver damage evident on post mortem. The condition was not observed in the homidium bromide herd. The surviving animals in the isometamidium chloride herd had a mean annual weight gain of 24 kg less than that recorded in the homidium bromide herd.
AuthorsR B Dolan, P G Stevenson, H Alushula, G Okech
JournalActa tropica (Acta Trop) Vol. 51 Issue 2 Pg. 113-21 (Jun 1992) ISSN: 0001-706X [Print] Netherlands
PMID1354929 (Publication Type: Comparative Study, Journal Article)
Chemical References
  • Phenanthridines
  • Trypanocidal Agents
  • isometamidium chloride
  • Ethidium
Topics
  • Animals
  • Cattle
  • Ethidium (therapeutic use)
  • Kenya
  • Male
  • Phenanthridines (therapeutic use)
  • Trypanocidal Agents (therapeutic use)
  • Trypanosomiasis, African (parasitology, prevention & control)
  • Trypanosomiasis, Bovine (parasitology, prevention & control)

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