Wool occurs on the skin of the lamb embryo stage. The hair follicle primordium occurs 50 to 55 days of embryonic day. The primary follicles are formed in the fetus from 65 to 85 days. The follicles appear in about 80 days, and within about 100 days thereafter Within 1 month after birth, the lamb appeared faster. If malnutrition occurs at this time, the rate of new hair follicles will slow down, and it will be less than the total number of hair follicles that can be genetically reached. Regarding the influence of nutritional status of the ewes on the hair follicle number in the later gestation period, some people used the former Soviet Union Merino sheep ewes. The results showed that the high-level diet group was lower than the low-level diet group, and the follicle primordial body area per square millimeter of skin area of ​​the newborn lamb. 18.2%, 49%, more 19.6% of the grown wool fibers (20). According to a study on the total number of hair follicles and wool fibers at different months in the Polesko wool sheep and Karakul sheep, it was found that after birth, the lambs could only form wool fibers from the hair follicles of the fetus. The fine wool sheep were formed when they were born. The wool fibers accounted for only 1/4-1/3 of the total number of hair follicles in the fetal period and about 1/2 for coarse wool sheep. The first month after birth was the fastest period for the development of wool fibers, if this period Lambs are rich in nutrients, and the development of fine-wool lambs wool fibers is usually postponed to 5 months of age or longer, while lambs are aged 4-5 months. On the contrary, if the nutrition level is poor, the undeveloped hair follicle original body will inhibit the growth of hair fibers. Therefore, improving the rearing of the ewes in the later period of pregnancy, feeding during the lactation period, and strengthening the rearing period of the lambs are important technical measures for improving the wool production performance of the wool sheep. It can be shown that the nutritional performance of the ewes during gestation and the birth of the lambs until weaning has an impact on the performance of lambs when they are adult. The growth trend of wool fibers in the four seasons of the year is basically balanced when the feeding conditions are relatively stable (except for the seasonal hair-removing raw coarse wool sheep breeds). However, in fact, due to seasonal changes, the supply of forage grass and its nutrient content are different, it is impossible to completely balance the feeding conditions. This results in fast growth and coarse hair when the nutrition is good. When the nutrition is poor, the growth rate becomes slower, the hair becomes thinner, the thickness of the wool is uneven, and the quality is reduced. According to data from the Yinlang Sheep Breeding Farm in Heilongjiang Province and the Xiaodong Sheep Farm in Liaoning Province, the growth rate of wool in northeast fine wool sheep was measured. The breeding and feeding supplies of rams were balanced throughout the year. The growth rate of wool was 0.5-0.8 cm in each month. The growth rate is 0.6 cm, especially in January-February. If you can enhance feeding, you can also get a higher rate of wool growth. The rams grew slower during the months of 8-9, which was related to the greater nutrient consumption during the mating season. The average monthly growth rate of adult ewes is 0.52 cm, and the slowest growth period is 1-2 months, which are 0.39 and 0.34 cm, respectively, which are related to the nutritional consumption of lambs and lactation. The fastest growing period for ewes is 8-9 months. It is the best grazing season for ewes. In the raising of wool sheep, if it is to increase its production and wool quality, it should try its best to provide nutritious and balanced nutrition throughout the year. Raising rams should be strengthened during the breeding period. The ewes should increase the nutritional level during pregnancy and lactation, which on the one hand can accelerate the occurrence of hair follicles and hair fiber formation, increase wool density, and on the other hand can increase the growth rate of wool and improve the quality of wool. China Agricultural Network Editor
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