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Submitted on: 12 March 2010.
Revised on: 22 June 2010.
Accepted on: 13 August 2010.
___________________Animal Production Science---CSIRO PUBLISHING
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Submitted on: 11 May 2004.
Revised on: 14 June 2004.
Accepted on: 30 July 2004.
___________________Animal Production Science---CSIRO PUBLISHING
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