Reproductive characteristics of farmed mink

The main results are as follows: 1. Male and female minks who are sexually mature at the age of 9 ~ 10 months, their testicles and ovaries grow and decline with time and light. After the Spring Equinox, the light increased and the testis gradually atrophied; after the Autumn Equinox, the light shortened and the testis developed. In February of the following year, the weight of the testis reached 22.5 grams and began to form sperm. The ovaries of the female mink also began to develop from the Autumn Equinox, and in early April of the following year, the ovaries began to shrink and the sexual cycle was completed.

2. The mink is a seasonal animal with multiple oestrus. The female mink has 2-4 estrous cycles in the mating season, with a cycle of 7-10 days, in which the estrus lasts 1-3 days. During this period, the female mink is easy to receive mating and the interestrus period is 4-6 days. 3. Minks are animals that stimulate ovulation, ovulating 36-72 hours after mating. After the first ovulation, the female mink has an ovulation refractory period of 5 to 6 days. If the second ovulation is not fertilized, the first fertilized eggs still exist, and if the second ovulation is fertilized, most of the previously fertilized eggs can not be implanted. 4. During the pregnancy of female mink, the process of embryonic development can be divided into cleavage stage, blastocyst diapause stage and embryo stage. 5. from the date of the last mating, the average gestation period of female mink is 47 ±2 days, and the range is 3757 days.