Effects of exogenous metallothionein membrane voltage (AXltm) of China Holstein co were randomly allocated to groups A, B, C and (MT) on lymphocytes apoptosis, ws were studied using 20 lactating necrosis and mitochondrial D. MT was supplemented at 0.0, 4. cows in heat stre 0, 8.0 and 16.0 ta, respectively, by intravenous injection. Corrected milk yields in groups B, C, and D than those in group A after being injected MT during days 51-60 (P〈O. 05) ; at 35 d, tosis rate of group C (8 mg/capita) was significantly lower than those of grou...