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Paper Information

Journal:   SCIENTIFIC-RESEARCH IRANIAN VETERINARY JOURNAL   FALL 2007 , Volume 3 , Number 3 (16); Page(s) 67 To 71.
 
Paper: 

PREVALENCE AND DISTRIBUTION OF BOVINE THEILERIOSIS IN ZAHEDAN, IRAN

 
 
Author(s):  MOZAFARI ALI ASGHAR, NOUR ELAHIFARD S.R., MOHAMMADI V.
 
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Abstract: 

This study was carried out to determine the prevalence and distribution of tropical theileriosis in cattle in Zahedan based on clinical examination, inspection of herd and microscopical methods. Giemsa-stained thin blood smears were prepared between April 2003 and May 2004 from cattle and examined for the presence of Theileria. A total of 600 whole blood smear samples were collected from cattle of various breeds and ages in Zahedan.
Piroplasms of Theileria annulata were detected in 5.6% of the samples (34/600). In clinical examination of infected cattle: paleness of mucosal membrane (61.7%), enlargement of lymph nodes (50%), icterus (17.6%), petechial hemorrhage (14.7%), diarrhea (2.9%), and coughing (2.9%) have detected in infected cattle. Ticks were identified to be Hyalomma anatolicum anatolicum on the basis of morphological features. In conclusion, lowest rate of infection were in group of >3 years old (5%) and the highest rate of infection was in cattle under one year old (76%) and this difference was statistically significant (P<0.05). Also there was a significant difference between the rate of infection in Holstein breed and local or hybrid cattle (P<0.05). The study showed that native calves were also more resistant than European Bos taurus (Holstein) calves to tick-borne tropical theileriosis (Theileria annulata infection).
Additionally, no significant difference was observed between male and female (p>0.05).comparison of results in different seasons indicated that the lowest and highest rate of infection were respectively observed in winter and summer.

 
Keyword(s): BOVINE THEILERIOSIS, THEILERIA ANNULATA, ZAHEDAN, IRAN
 
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