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Submitted on: 07 August 2000.
Revised on: 03 October 2000.
Accepted on: 22 October 2000.
___________________JOURNAL OF DAIRY RESEARCH---CAMBRIDGE UNIV PRESS
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Submitted on: 15 April 2000.
Revised on: 21 July 2000.
Accepted on: 30 August 2000.
___________________JOURNAL OF DAIRY RESEARCH---CAMBRIDGE UNIV PRESS
Submitted on: 08 November 2009.
Revised on: 30 January 2010.
Accepted on: 15 February 2010.
___________________JOURNAL OF DAIRY RESEARCH---CAMBRIDGE UNIV PRESS
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