Submitted on: 09 April 2018.
Revised on: 31 May 2018.
Accepted on: 06 July 2018.
___________________Animal Frontiers---OXFORD UNIV PRESS INC
http://reply.papertrans.cn/1/17/1660/1660-32.png
Submitted on: 17 February 2017.
Revised on: 13 April 2017.
Accepted on: 11 June 2017.
___________________Animal Frontiers---OXFORD UNIV PRESS INC
http://reply.papertrans.cn/1/17/1660/1660-34.png
Submitted on: 27 February 1998.
Revised on: 06 April 1998.
Accepted on: 01 May 1998.
___________________Animal Frontiers---OXFORD UNIV PRESS INC
http://reply.papertrans.cn/1/17/1660/1660-36.png