Funding for this research was provided by:
National Natural Science Foundation of China (31872330, 31802041)
Earmarked Fund for Modern Agro-industry Technology Research System (CARS-36)
Beijing Dairy Industry Innovation Team (BAIC06-2018/2019)
Beijing Science and Technology Program (D171100002417001)
National Science and Technology Programs of China (2013AA102504)
Program for Changjiang Scholar and Innovation Research Team in University (IRT_15R62)
Received: 26 January 2019
Accepted: 20 June 2019
First Online: 3 July 2019
Ethics approval and consent to participate
: All protocols for collection of the samples of experimental individuals and phenotypic observations were reviewed and approved by the Institutional Animal Care and Use Committee (IACUC) at China Agricultural University (Permit Number: DK996). Milk, blood and semen 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.