ACKNOWLEDGEMENTS
This study was supported by, Introduction of Leading Talents Program of
Guangdong Academy of Sciences (No. 2016GDASRC-0205), GDAS Special
Project of Science and Technology Development
(No.2018GDASCX-0107), Earmarked
Fund for Hebei Dairy Cattle Innovation Team of Modern Agro-industry
Technology Research System (No. HBCT2018120205).