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Submitted on: 01 December 2012.
Revised on: 29 December 2012.
Accepted on: 18 February 2013.
___________________ANIMAL GENETICS---WILEY
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Submitted on: 14 February 2016.
Revised on: 27 March 2016.
Accepted on: 22 April 2016.
___________________ANIMAL GENETICS---WILEY