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The main factors that affect the water exchange velvet long hair
Breeding and moulting show significant seasonal changes. The main factors influencing leech breeding and moulting are light conditions. The four seasons have distinct photoperiodic changes that are conducive to breeding and moulting of leech, followed by feeding of nutrients and temperature. And environmental factors. (I) Light conditions Water otters are seasonally breeding mammals, and are twice-seasoned seasonal fur animals. This seasonal reproduction and molting is due to the fact that the otters live in areas above 45 degrees north latitude, long-term adaptation to the environmental conditions in such high latitude areas, and the natural selection and genetic adaptation to become leeches. A prominent ethnic feature. Since the watercress ancestors lived in high latitudes for a long time, its physiological activities such as metabolism, growth and development, reproduction, and molting established a close relationship with the periodicity of high latitudes, especially as a trigger signal for realizing the reproductive and moulting cycles of leech. Necessary conditions. There is also a close relationship between interdependence and restriction between the reproductive cycle and the hair replacement cycle. After the autumnal equinox, the reproductive organs began to develop slowly. At the same time, the summer hair fell off and the winter hair grew. Here, the equinox signal seems to play a "boarder" role. Since then, with the shortening of the sunshine time, after about 70 to 80 days, the winter hairs have developed and matured, indicating that the hair removal hairs are a short-day response. After the vernal equinox, the sunshine duration continued to increase, and the daytime began longer than the night. The winter hair falls off and the summer hair grows. Here, the vernal equinox seems to play a "boarder" role. After the vernal equinox, the emergence of summer hairs until the summer hair is mature is a long-day response. Artificial control of photoperiodic changes to change the reproduction of leeches and a large number of scientific experiments on the cycle of hair replacement, in theory, further reveals the inherent laws of photoperiod variation and closely related to the cycle of reproduction and hair replacement. Once shaggy hair grows or completes its growth and development, artificially shortening the time of daily light can accelerate the fall of the summer hair and begin the growth and development of winter hair, but the growth rate of winter hair is constant, and it is started to shorten the illumination time. No date. After the signal is given to the Chiaki, with the shortening of the illumination time, the summer hair begins to fall off, and the winter hair begins to grow. From the time it is given to the completion of the growth and development of the winter hair, it takes 80 to 90 days. In recent years, with the gradual recognition and mastery of the laws relating to the changes of the photoperiod and the reproductive cycles of the leeches and the hair-changing cycles, these laws have been applied to the production practice of raising pupa, and obvious results have been achieved. The maturity of mink winter hair is generally from late November to early December. It has been proved that as long as the summer hair grows, whether it is mature or not, artificially give the autumnal signal, and then gradually shorten the daily sunshine time, after 80 to 90 days, the winter hair can be mature. Therefore, winter hairs can be matured in advance by skin-controlling and raising melatonin or implanted with melatonin. (2) Nutritional level The basic substances necessary for the vital activities such as metabolism, growth and development, reproduction, and molting are called nutrients. It includes proteins, fats, carbohydrates, vitamins, minerals and moisture. Feeds for raising otters vary widely, contain various nutrients, and the quality of feed varies. These all have a direct impact on the growth, development, reproduction, and exchange of leeches. Using different feed and feeding systems can produce different production effects. Therefore, feed nutrition is closely related to the production effects of leeches. By fully understanding the physiological functions of various nutrients, the amounts of various nutrients contained in various feeds, and the nutritional value thereof, we can scientifically and economically formulate the diet of leech so as to give full play to the production performance of the leech and achieve the raising of the leech. The intended purpose. Mink malnutrition during molting period will cause the summer hairs to fall off, the winter furs grow insufficiency, white velvet, eating hair, self-biting and other conditions, which will seriously affect the quality of the fur. (c) climatic conditions The temperature of the air will affect the density of the needle hair, the light intensity will affect the shade of the hair, bad weather conditions will affect the length of the hair and peace. (4) Variety types and individual differences The quality of fleas of different cultivars is very different. Only fine leeches can produce high-quality fur. Different color types of leeches have a difference in their winter and winter maturation periods. In general, the lighter the color matures, the sooner it is. Different individuals will have a difference between the morning and night of mating, and the sooner or later of maturation. Generally, maternal maties mature earlier than mature males, and maturing matures earlier than males. Well-wintered mandarin hairs mature earlier. In general, the main factor influencing the start of hydration of moult is the change of photoperiod, and the main factors affecting the quality of moulting and the quality of fleece and the size of the hide are determined by the level of feeding and management.