Funding for this research was provided by:
National Natural Science Foundation of China (31802041, 31872330, 31472065, and 31072016)
Natural Science Foundation of Beijing Municipality (6152013)
Beijing Dairy Industry Innovation Team (BAIC06-2017/2018)
National Science and Technology Programs of China (2013AA102504 and 2014ZX08009-053B)
Program for Changjiang Scholar and Innovation Research Team in University (IRT_15R62)
Received: 6 November 2018
Accepted: 6 August 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: All protocols for collection of the tissues of experimental individuals and phenotypic observations were reviewed and approved by the Institutional Animal Care and Use Committee (IACUC) at China Agricultural University. Tissue samples were collected specifically for this study following standard procedures with the full agreement of the Beijing Sanyuanlvhe Dairy Farming Center who owned the Holstein cows and bulls, respectively.
: Not applicable.
: The authors declare that they have no competing interests.