This work was supported by the program of Chinese 12th FiveYear
Plan: Southern cities cows' health and aquaculture integration
and industrialisation (No. 2012BAD12B08). Financial support was
provided by Bright Dairy Co., Ltd. (China). All data were recorded on
case report forms, double-entered, verified, and independently
monitored for accuracy by the consulting company, Sprim
Advanced Life Sciences.