The concept of mink skin and the growth and development of winter hair
(A) Hair and Skin
The blister skin consists of the epidermis and the dermis, and the main derivative of the skin is hair. Fur is the collective name for hair and skin. The bristles of the bristles are mainly classified into clenches, pin hairs, and down hairs. The skin covers the entire surface of the body and the hair is covered throughout the body, protecting and regulating body temperature.
Seasonal change of fur
The growth of mink bristles to a certain period of time will gradually emerge from the hair follicles and be replaced by new hairs, which is called molting. 2. The otters swap hair twice a year. Spring winter hair long summer hair, autumn winter hair winter hair, belong to the cycle of seasonal hair change
Spring fur change:
With the arrival of the mating season, the embryonic hairs of Shamao begin to form under the dermis. After the vernal equinox, with the end of the mating season, winter hairs begin to fall off and the summer hair grows. The hair replacement sequence begins with the head and the foot, gradually expanding from the front to the back, and the buttocks and tails finally displacing. Newborn Xia Mao also grows in this order.
Autumn hair change:
With the gradual shortening of the sunshine time, generally in late August, the sunshine duration is approximately 13.5 to 12.5 hours, and the winter embryonic hair begins to grow and develop in the skin. After the autumnal equinox, the summer hair falls off and the winter hair grows. Autumn hair replacement is faster than spring hair replacement. The sequence of hair replacement is the opposite of the sequence of hair replacement in spring. It starts from the tail and extends to the head via the buttocks and torso. Because the front hair is short, the growth period is also short: the buttocks, the tail hairs are long, and the growth period is long. Therefore, the fur or the front matures first, and the buttocks and the tail finally mature.
(C) the growth and development of young winter cubs after 50-60 days after nesting, the young quail's appetite is very strong, the most rapid growth and development, this period is the critical period to determine the size of the blister. 110 to 180 days after the litter split, young calves begin to desiccate wool long winter hair, this period is the critical period to determine the quality of fur. From the birth to the winter hair mature, Tsai's hair and soft exchange will go through 3 times, that is, the fetal wool will be replaced with the early plush, the plush will be replaced with the summer hair, and the summer hair will be replaced with the winter hair. Its winter hair is of the same age as the adult, but it is later than the adult.
(d) Growth patterns of adult winter hair
Mink is a seasonal hair-changing animal. Adults change their hair twice a year, once when they remove winter wool, and once when they wear wool for winter wool. The realization of this seasonal demolition is based on changes in the photoperiod. The wintering wool is carried out under long-day conditions, and the wool-wool removal is carried out under short-day conditions. After the summer solstice, the sunshine is gradually shortened, and when the sunshine is shortened to about 13 hours, that is, about 70 days after the summer solstice, the skin of winter “embryonic hair†begins to grow with the development of “fetal hairâ€, and the skin color changes from the tail to the head. Gradually darker, when the sunshine is gradually shortened to 12.0 to 11.5 hours, that is, after the autumnal equinox, the winter fur grows and the summer hair falls off. At this time, the skin color is the deepest. When the sunshine is shortened to 11.0 to 10.5 hours, that is about 30 days after the autumnal equinox, except for the head, the whole body has long hairs. When the sunshine is shortened to about 9.5 hours, that is, about 90 days from the start of the winter “embryonic hairâ€, the whole body is long and the skin color becomes pale pink, and the winter fur reaches maturity. The speed of growth and development of winter hair, under the premise of satisfying the nutritional needs of Minamata, is the greatest effect of photoperiod changes. After the blisters' hair grows out of the skin, its shape is certain until it falls off and no longer changes. Therefore, from the beginning of winter hair growth and development, it is necessary to strengthen the feeding and management in order to improve the quality of fur.
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