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Submitted on: 18 April 2007.
Revised on: 16 July 2007.
Accepted on: 01 September 2007.
___________________Journal of the South African Veterinary Association
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Submitted on: 05 April 2007.
Revised on: 27 May 2007.
Accepted on: 27 June 2007.
___________________Journal of the South African Veterinary Association
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