Funding for this research was provided by:
the talent cultivation and developmental support program of China agricultural university
an award to study the cultivation of high-quality mutton sheep varieties (or lines) from Ningxia province (NXNYYZ20150101)
Natural Science Foundation of Hebei Province of China for Youths (C2019402261)
Received: 11 March 2021
Accepted: 31 August 2021
First Online: 2 November 2021
: Experimental procedures were approved by the Animal Welfare Committee in the State Key Laboratory for Agrobiotechnology at China Agricultural University (approval number XK257) and this study was carried out in strict accordance with the guidelines and regulations established by this committee.
: Not applicable.
: The authors declare that they have no competing interests.