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Submitted on: 28 August 2004.
Revised on: 18 October 2004.
Accepted on: 28 October 2004.
___________________Italian Journal of Animal Science
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Submitted on: 04 February 2004.
Revised on: 03 June 2004.
Accepted on: 08 July 2004.
___________________Italian Journal of Animal Science
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Submitted on: 24 September 2010.
Revised on: 14 November 2010.
Accepted on: 03 January 2011.
___________________Italian Journal of Animal Science
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