Funding for this research was provided by:
Zhejiang Major Scientific and Technological Projects for Breeding of New Breed of Livestock and Poultry (Grant No. 2016C02054)
Text and Data Mining valid from 2019-08-06
Received: 25 April 2019
Accepted: 26 July 2019
First Online: 6 August 2019
: Animal studies were conducted in accordance with the guidelines of the Zhejiang Farm Animal Welfare Council of China and approved by the ethics committee of Zhejiang Academy of Agricultural Sciences.
: Not applicable.
: The authors declare that they have no competing interests.