Establishment of an enzymatic hydrolysis evaluation index for dairy cows’ placental hydrolysates oleh Liu-hong Shen, Ying-kun Zhu, Liu-chao You, Yue Zhang, Bo-lin Qian, Jin-bang Xiao, Li-kou Zou, Sui-zhong Cao, Guang-neng Peng, Shu-min Yu, Zhi-cai Zuo, Xiao-ping Ma, Zhi-jun Zhong, Zhi-hua Ren, Ya Wang, Hai-feng Liu, Zi-yao Zhou, Dong-jie Cai, Xiao-lan Zong, Jun-liang Deng