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Submitted on: 25 November 2004.
Revised on: 26 December 2004.
Accepted on: 22 January 2005.
___________________Iranian Journal of Veterinary Research
Submitted on: 19 July 2005.
Revised on: 21 October 2005.
Accepted on: 02 November 2005.
___________________Iranian Journal of Veterinary Research
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Submitted on: 30 January 2006.
Revised on: 27 April 2006.
Accepted on: 07 June 2006.
___________________Iranian Journal of Veterinary Research
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Submitted on: 04 December 2004.
Revised on: 23 January 2005.
Accepted on: 01 March 2005.
___________________Iranian Journal of Veterinary Research