Funding for this research was provided by:
Chengdu Giant Panda Breeding Research Foundation (CPF2017-10)
Chengdu Research Base of Giant Panda Breeding (2020CPB-C10)
Received: 29 May 2020
Accepted: 16 November 2020
First Online: 3 December 2020
Ethics approval and consent to participate
: The experimental protocol was approved by the Chengdu Research Base of Giant Panda Breeding and in accordance with the current laws on animal welfare and research in China.
: Not applicable.
: The authors declare that they have no competing interests.