Abstract: In order to study the effect of different combinations of exogenous hormones on the propagation ability of silver fox, randomly selected 50 healthy female silver foxes, which were divided into four test groups and one control group, 10 silver foxes in each group. In the first ten days of female fox ovulation, 4 test groups were injected with exogenous hormones, 2 kinds of hormones were injected in each group (number 1 and number 2), and the hormones of number 1 and number 2 were different in each grope. The female fox in the control group were managed by conventional breeding way. The results showed that in test 1 group （the combination of PMSG+HCG）,compared with the control group, the average amount of each female silver litter averagely multi-produced 1.3 of each female fox, the difference was very significant (P＜0.01); compared with the control group, the average amount of each female silver litter in test 2 group (the combination of FSH + LH hormone combination), averagely multi-produced 0.9 of each mother fox, and the difference was remarkable (P＜0.05); While the difference of the amount of litter of test 2 group (the combination of Triple Hormone+LRHA3) and test 3 group (the combination of LRHA3+LRHA3） with the control group was not remarkable. By multiple comparison of 4 test groups (q testing Way), the difference of test 1 group with test 2 group and test 3 group was very significant (P＜0.05), while the difference with test 4 group was not significant （P＞0.05）; the difference of among test 2, test 3 and test 4 was not significant. By the contrast of character with price, the rate of hormone character with price of PMSG + HCG hormone combinations (0.078) was the highest; the rate of hormone character with price of other three hormone combinations were all low (P＞0.05). Overall, in PMSG+HCG hormone combination, the average amount of litter was more, the rate of hormone character with price was high, and the application results were obvious (P＞0.05).

Key words: external hormone; silver fox; propagation ability