Ninety rats were randomly assigned to five dosage groups of 18 each (T~, T2, T3, V, S, which was immunized with 10, 50, 100 μg · 100 μL^-lof pCISI, 100 μg pcMV-S and 100 μL physiological saline per rat, respectively) to investigate the effect of double copies inhibin pcISI gene immunization on follicle development, production and reproductive hormones without any immune adjuvant. The results showed that the booster immunization could improve P/N value of antibody against inhibin, groups was higher than 2 group was higher than th the aver...