Auxiliaries (Additives) are defined in medicine as excipients and additives used in the production of drugs and prescriptions, that is, all materials except the main active ingredients of drugs, are important components of pharmaceutical preparations. In industrial production, auxiliary chemicals added to improve the production process, improve product quality and yield, or to endow the product with a specific application performance. It is also called additive. However, as an important component of the product matrix, large doses of additives, which have a significant impact on the shape, structure and performance of the product, are generally not included in the category of additives.
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When selecting good varieties, it is also necessary to strengthen selection and matching of the seeds, otherwise the quality of the population will be rapidly degraded. From the perspective of genetic breeding, long hair rabbits have a strong heritability in hair yield, so individual selection can be made through direct measurement of wool yield and rabbit hair quality. When the rabbit farm was selected for the first time, the amount of milk wool that had been cut for the first time (55 days to 60 days for raising hair) was less than 30 grams for winter and spring, and less than 20 grams for summer and autumn could not be planted.
Second, the hybrid improvement For the hair yield is not high, the hair quality is not a good group, the simplest and most economical method is to select the appropriate high-product male rabbits and their female mating, to improve hybridization. Experiments show that this method works well.
Third, to increase the proportion of females in the general female female rabbits than the male rabbit hair production, the difference is as high as about 25%, and female rabbits rabbit hair blocking rate is also lower than the male rabbit. Castrated male rabbits have higher hair yields than non-castrated male rabbits. For the groups that are specifically used for rabbit hair production, the proportion of female rabbits in the rabbit population can be increased, and the male rabbits can be cast to increase the gross hair production and rabbit hair quality.
Fourth, to maintain a reasonable age structure of the group different ages, rabbit hair production and quality are different. Rabbits less than 1 year old have low hair production and poor rabbit hair quality. After 1 year of age, the amount of wool produced increased by the knife (time), and when it was between 420 and 490 days of age, the amount of wool production reached the highest, and then the annual output of wool decreased by 10% to 15%. The degradation rate of male rabbits is more pronounced than that of female rabbits. The hair-bearing life of the hairy rabbit is 3 to 4 years, and the best age for hair production and quality is between 1 and 3 years old. To this end, the proportion of rabbits aged 1 year to 2 years in the population can be increased. In this way, sufficient reserves must be cultivated each year to supplement the groups.
Fifth, to ensure a balanced and full-price nutrient supply The main component of rabbit hair is keratin, which contains 16.8% of nitrogen and 40.2% of sulfur (exist as sulfanilic acid). Therefore, it is necessary to feed proteins and diets rich in sulfur amino acids to increase the concentration of essential amino acids in the tissue fluid surrounding the hair follicles and promote the growth of rabbit hair. Therefore, in the production of rabbit hair, the protein should contain about 17%, sulfur-containing amino acids should not be less than 0.6%, and lysine should be 0.65%.
6. Increasing hair follicle density Rabbit hair yield is closely related to rabbit hair density, which in turn depends on the number of hair follicles. The differentiation and production of the secondary hair follicles are mainly in the late pregnancy and early postnatal period. Therefore, it is important to strengthen the feeding of female lactation during the main lactation period, and to pay attention to supplementation of the pups, which is an important measure to increase the number of hair follicles.
Seven, use of hair-pushing technology
1. Supplementing trace elements in feed can increase rabbit hair production. According to reports, long-haired rabbits feed 0.15 mg of zinc chloride and 0.4 mg of calcium sulfate per kilogram of body weight per day, and the hair growth rate can be increased by 6.8%. If you add 0.1 mg of cobalt chloride, you can increase by 11.3%.
2. According to experiments conducted by the Institute of Animal Husbandry and Veterinary Medicine, Shanxi Academy of Agricultural Sciences, adding rabbit Bao III additive to the rabbit diet can increase wool production by 18.6%.
3. It has also been reported that adding 0.03% to 0.05% of rare earth in the diet not only improves wool production by 8.5% to 9.4%, but also increases the proportion of high quality hair by 43.44% to 51. 45%.
VIII. Strengthening management Strengthening the management of rabbits is of great significance for improving rabbit hair quality. Single cage feeding is a prerequisite for improving the quality of rabbit hair. Cage keeping can be kept clean from hair. There must be grass racks in the rabbit cages to prevent forage and grass markings from falling onto exempt bodies when feeding. Clean, diligently clean, disinfect, maintain good sanitation and reduce hair contamination. Regular grooming of rabbit hair prevents tangle and reduces quality. In addition, the rabbit cage should be closed, and the cage floor should be repaired in time after being damaged to prevent rabbits from running outside the cage. The rabbit's hair is contaminated with excrement.
IX. Reasonable hair-picking is mainly based on shearing in summer, and plucking is the main factor in winter. This will not only increase the amount of wool and hair quality, but also conducive to rabbit health. When the wool is collected, the hair should be grading, graded, and kept in grades. In addition, when the wool rabbit hair exchange should be appropriate to shorten the hair-raising period, increase the number of hair-picking, can increase the rabbit hair production.
Ten, improve the shearing technique to cut the hair when tightening the skin, close to the skin cut, shearing sequence for the back - body two jaws - head - hips lower abdomen, limbs. It is forbidden to cut the two knife hairs, and separate the good hairs from the secondary hairs while cutting them. The removal of contaminated hairs and agglomerated hairs will help improve the quality of rabbit hair.
XI. Preventing and treating diseases and ensuring that healthy rabbits in rabbits suffer from diseases such as sputum, fungal diseases, and skin diseases will all affect the rabbit's hair yield and quality. To this end, rabbits were inspected every day and rabbits were promptly discovered and promptly treated.疥螨 can be treated with oral necrosis (powder or injection) orally or subcutaneously. Fungal disease can be treated with griseofulvin, the dose of 40 mg to 70 mg per kg of body weight taken orally, 15 days for a course of treatment, interval 5 days to 7 days to feed the second course of treatment.
Technical measures to improve rabbit hair production and quality
First, the selection and breeding of improved varieties and strengthen the selection of different varieties (lines) different, rabbit hair production and quality vary widely. At present, among the breeds of long-haired rabbits raised in China, the hair growth rate of the German hairy rabbits is as high as 1600 g to 1800 g, the fine hair content is 95%, and the coarse hair content is 2% to 5%, and the rabbit hair is not easily tangled. Good quality, suitable for the production of rabbit hair. The hairy rabbits of the French system have a moderate wool yield and a high gross hair rate. In recent years, China has successively cultivated new breeds (lines) or groups suitable for different purposes, high wool yields, and good hair quality.