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Submitted on: 28 January 2001.
Revised on: 11 March 2001.
Accepted on: 17 April 2001.
___________________ANIMAL REPRODUCTION SCIENCE---ELSEVIER
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Submitted on: 16 March 2017.
Revised on: 07 July 2017.
Accepted on: 05 September 2017.
___________________ANIMAL REPRODUCTION SCIENCE---ELSEVIER
http://reply.papertrans.cn/1/17/1674/1674-35.png
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