2 feed, increase green feed and juicy feed. Give one-third of the feed on the same day, and gradually increase the feed amount after the third day. If the female boar is found to have no milk, apply traditional Chinese medicine to promote lactation: 60g, 60g of Trichosanthes, 40g of radix rhapontici, 30g of stiff rice, 40g of medulla tetrapanacis, one eliminated pheasant, 50g of brown sugar, 50g of ginger, 0/00g of black beans/kloc, and 0/50g of glutinous rice wine 150g of water to feed a female boar. The 5-and 7-day-old wild piglets began to feed. In general, the number of deaths before the 7-day-old piglets accounted for about 60% of the total number of newborns. The main reasons were: the mother wild boar lacked milk, and the piglets could not eat colostrum, which reduced their resistance and led to diarrhea and cough. In addition, the ground manure will pollute the nipple of female wild boar, and the fundamental measure is to make a high-bed delivery bed and a nursing net bed. The damp and cold barns are one of the causes of diarrhea in piglets. 6. Keeping piglets warm is the key to prevent diarrhea and cough. Therefore, the floor should be padded with wooden boards and infrared insulation lamps to ensure that animals are in good spirits and active. 7. Strengthen the professional training of breeders: breeders should carefully observe whether their coat color, breathing, mental state and eating are normal. Once found, they should be treated immediately, with the lowest cost and the best effect, and the general cure rate is over 95%. 8. The use and operation of the vaccine are reasonable, and the usage and dosage are accurate. Piglets were given nasal drops by pseudorabies at the age of 3 days, and 7 plague cells and 25 sows were injected into muscles after weaning 30 days later. During weaning, add 200g milk powder to the feed, twice a day, eat and drink freely, keep the room clean and dry, and add palatable brown sugar and antibiotics to the feed to prevent diarrhea. 10 days later, transfer to the weaned piglet pen. 60 days to be a pseudo-rabies and swine fever. 9. After weaning sow, change pregnant feed to 3 days after mating. Check the situation on 17 days, check again on 35 days to ensure that there is no estrus, transfer to the pregnant pen and increase feed on 90 days, and turn around the delivery room before delivery, so that the whole cycle has a transition period, and only by ensuring the birth of healthy piglets can the survival rate of piglets be improved and the benefits be improved. Selection method of wild boar feed Special wild boar has gradually become a substitute for domestic pigs and a new type of green health food because of its low fat, high nutritional value and rich game. Special wild boar has a small food intake, which can generally be fed twice a day. It likes raw food and has miscellaneous eating habits. All kinds of weeds, vegetable leaves, plant roots and crop straws can be used as feed for wild boar. Wild boar especially likes to eat green feed, which can account for more than 50% of the diet. With a small amount of concentrated feed, strong wild boar can be raised. Here are some kinds of feed for wild boar. 1. Green and juicy feed includes green feed, tuber, root tuber, melon and fruit feed and silage, which is the main feed source of wild boar. 1, green feed: commonly used are alfalfa, purple celery root, amaranth, sweet potato vine leaves, green corn, green barley and so on. Green feed has high protein content, high digestibility, comprehensive amino acids, rich vitamins, excellent quality and high utilization rate. 2. Feed for tubers, tubers and melons and fruits, including sweet potatoes, potatoes, pumpkins and carrots. This kind of feed is crisp, tender and juicy, can stimulate appetite, and has high digestibility of organic matter, which plays an important role in improving the nutritional composition and digestibility of diet. However, it is not suitable for feeding alone, and it must be used in combination with coarse feed and concentrated feed, and supplemented with protein feed, so as to achieve the feeding effect. 3. Silage is to store the green feed for feeding in the off-season of winter and spring. Commonly used as silage are sweet potato, rattan leaf, cabbage patch, radish tassel, cabbage patch and grass. Second, roughage roughage includes hay, agricultural and sideline products (pods, vines, vines, shells, stalks, seedlings, etc.), leaves and dregs. They have wide sources, many kinds and large output, and are the main feed for wild boar in winter and spring. The crude fiber content of roughage is high, and the teacher can preach and teach! 3450 1 1729 Liujianbogzjp
2 feed, increase green feed and juicy feed. Give one-third of the feed on the same day, and gradually increase the feed amount after the third day. If the female boar is found to have no milk, apply traditional Chinese medicine to promote lactation: 60g, 60g of Trichosanthes, 40g of radix rhapontici, 30g of stiff rice, 40g of medulla tetrapanacis, one eliminated pheasant, 50g of brown sugar, 50g of ginger, 0/00g of black beans/kloc, and 0/50g of glutinous rice wine 150g of water to feed a female boar. The 5-and 7-day-old wild piglets began to feed. In general, the number of deaths before the 7-day-old piglets accounted for about 60% of the total number of newborns. The main reasons were: the mother wild boar lacked milk, and the piglets could not eat colostrum, which reduced their resistance and led to diarrhea and cough. In addition, the ground manure will pollute the nipple of female wild boar, and the fundamental measure is to make a high-bed delivery bed and a nursing net bed. The damp and cold barns are one of the causes of diarrhea in piglets. 6. Keeping piglets warm is the key to prevent diarrhea and cough. Therefore, the floor should be padded with wooden boards and infrared insulation lamps to ensure that animals are in good spirits and active. 7. Strengthen the professional training of breeders: breeders should carefully observe whether their coat color, breathing, mental state and eating are normal. Once found, they should be treated immediately, with the lowest cost and the best effect, and the general cure rate is over 95%. 8. The use and operation of the vaccine are reasonable, and the usage and dosage are accurate. Piglets were given nasal drops by pseudorabies at the age of 3 days, and 7 plague cells and 25 sows were injected into muscles after weaning 30 days later. During weaning, add 200g milk powder to the feed, twice a day, eat and drink freely, keep the room clean and dry, and add palatable brown sugar and antibiotics to the feed to prevent diarrhea. 10 days later, transfer to the weaned piglet pen. 60 days to be a pseudo-rabies and swine fever. 9. After weaning sow, change pregnant feed to 3 days after mating. Check the situation on 17 days, check again on 35 days to ensure that there is no estrus, transfer to the pregnant pen and increase feed on 90 days, and turn around the delivery room before delivery, so that the whole cycle has a transition period, and only by ensuring the birth of healthy piglets can the survival rate of piglets be improved and the benefits be improved. Selection method of wild boar feed Special wild boar has gradually become a substitute for domestic pigs and a new type of green health food because of its low fat, high nutritional value and rich game. Special wild boar has a small food intake, which can generally be fed twice a day. It likes raw food and has miscellaneous eating habits. All kinds of weeds, vegetable leaves, plant roots and crop straws can be used as feed for wild boar. Wild boar especially likes to eat green feed, which can account for more than 50% of the diet. With a small amount of concentrated feed, strong wild boar can be raised. Here are some kinds of feed for wild boar. 1. Green and juicy feed includes green feed, tuber, root tuber, melon and fruit feed and silage, which is the main feed source of wild boar. 1, green feed: commonly used are alfalfa, purple celery root, amaranth, sweet potato vine leaves, green corn, green barley and so on. Green feed has high protein content, high digestibility, comprehensive amino acids, rich vitamins, excellent quality and high utilization rate. 2. Feed for tubers, tubers and melons and fruits, including sweet potatoes, potatoes, pumpkins and carrots. This kind of feed is crisp, tender and juicy, can stimulate appetite, and has high digestibility of organic matter, which plays an important role in improving the nutritional composition and digestibility of diet. However, it is not suitable for feeding alone, and it must be used in combination with coarse feed and concentrated feed, and supplemented with protein feed, so as to achieve the feeding effect. 3. Silage is to store the green feed for feeding in the off-season of winter and spring. Commonly used as silage are sweet potato, rattan leaf, cabbage patch, radish tassel, cabbage patch and grass. Second, roughage roughage includes hay, agricultural and sideline products (pods, vines, vines, shells, stalks, seedlings, etc.), leaves and dregs. They have wide sources, many kinds and large output, and are the main feed for wild boar in winter and spring. The crude fiber content of roughage is high, and the teacher can preach and teach! 3450 1 1729 Liujianbogzjp
Vitamin D is rich in content, containing more calcium but less phosphorus, so it should be well matched with other feeds when feeding. 3. Concentrated feed 1, energy feed: It includes corn, sorghum, barley, rice, sweet potato and other cereal seed processing by-products, such as chaff and bran. These feeds are high in energy and low in crude protein, only 7% ~11%.Because of the unbalanced nutritional structure, they are not suitable to be used as feed for wild boar alone. 2. protein feed: including plant protein feed, animal protein feed and other protein feeds. Plant protein feed mainly includes bean cake, peanut cake, cottonseed cake and other by-products of oil extraction industry, and their protein content is high, accounting for about17% ~ 45%. Fish meal is the most widely used animal feed in protein, with protein content of 40% ~ 60%, which is particularly useful in supplying methionine and lysine with high nutritional value. Bone meal, blood meal, silkworm chrysalis, etc. are also good animal feed for protein, which can be mixed as ingredients of compound feed according to needs and conditions. Other protein feeds mainly refer to chicken manure, yeast, bacteria, etc. If 30% fermented chicken manure (50 kg chicken manure with ferric sulfate 1 kg, 25 kg water, mixed and fermented for1~ 2 days) is added to the diet, its nutrition is similar to that of wheat bran and rice bran, and its refined protein content is 25.5% ~ 31.8%, so the feeding effect is excellent and can be improved. Iv. Feed additives At present, there are nutrient additives such as vitamins, amino acids, minerals and trace elements, growth promoters such as antibiotics, enzyme preparations, growth promoters and sedatives, and Chinese herbal medicine additives. When raising wild boar, according to the nutritional components of various feeds in the diet and the nutritional needs of wild boar in different periods, a small amount or trace of the above nutrients are added to make the diet nutritious, which can significantly improve the utilization rate and conversion rate of feed, reduce the nutritional loss of feed during storage and improve the quality of wild boar; Antibiotics and Chinese herbal medicine additives can stimulate growth, enhance immunity and prevent some diseases. After years of research, the Chinese medicine additive made of 20 kinds of precious Chinese medicines, such as Leiwan, Atractylodes macrocephala, Ramulus Cinnamomi, Crataegus pinnatifida, Rhizoma Osmundae, Scutellariae Radix and Magnolia Officinalis, has been proved to have the effects of invigorating spleen and kidney, promoting digestion and strengthening stomach, clearing away heat and toxic materials, and has obvious effects on strengthening physique, promoting growth, preventing and treating colds, dysentery, parasitic diseases and colibacillosis. Estrus and mating of wild boar 1. Reproductive cycle of wild boar The sexual maturity of wild boar (purebred) is late, and it takes 1 0-20 months after birth, and 1 year only gives birth1fetus. Generally, they mate every year 10, and give birth in April-May of the following year. The gestation period is120-140 days, with 4-6 litters per fetus. The nipple number of wild boar is 3-5 pairs, and male wild boar often fights for couples in breeding season. The sexual maturity of special (cross selection) wild boar is earlier, about150-190 days after birth, estrus1-3 days, and sexual cycle is 22-23 days. The first generation hybrid of male wild boar and female domestic pig, the mating and climbing time is short, and it ends in 2-3 minutes. The penis of boars is short, so it is difficult to collect sperm. The semen volume is only half that of domestic pigs, about 100-150 ml. The number of sperm per milliliter of semen is about 1 billion. The average gestation period of the first generation of hybrid wild boar is 1 15.6 days, and that of interspecific hybrid wild boar is 1 15.8 days. Wild boar's coat is thick and thin, generally gray or grayish yellow. Adult sows weigh 90 kg ~ 130 kg, and those who respond to the external environment will preach and teach! 3450 1 1729 Liujianbogzjp
4 sensitive. Generally, there are 6 ~7 pairs of nipples of female wild boar, with an annual output of 2.5 fetuses, which is generally 0 ~ 0/5 per fetus/kloc-0. The suitable breeding time is 5 to 6 months after birth, and the weight is 40 to 60 kilograms. When female wild boar is in estrus, the principle of early primiparous sows and late multiparous sows is generally adopted. When the wild boar is in estrus, the external genitalia is obviously red and swollen. When the external genitalia changes from red to dark purple, from swelling to slightly shrinking, or when the sow stands still with her hands, it is the best breeding time. The mating time of male and female wild boar is slightly longer than that of domestic pig. According to the experience, it is best to adopt the compound method, that is, repeat mating after an interval of 6 hours to 8 hours. This can obviously improve the conception rate of sows. When the female boar is in estrus, the method of herding the boar into the sow pen 1 day ~2 days can also be adopted. At this time, the male boar can climb and mate many times at night. After the mating is confirmed to be successful, the male boar will be driven out. After 20 days, observe whether the female wild boar is still in estrus. Generally, the estrus cycle of the female wild boar is 18 days. If it is not in estrus, it proves that the wild boar has mated successfully. Breeding pigs who choose to engage in wild boar breeding must have 1 head to 2 purebred wild boars. As the saying goes: sow is good, a good nest; Boars are good, what a slope. This shows the importance of boar. Choosing a good breeding boar is of great significance to the offspring. Generally, purebred wild boars with body length, leg height and tip of mouth are selected as breeding pigs. The offspring of a special wild boar bred by crossing a wild boar with a domestic pig are reserved, and the bred offspring have atavism, that is, some of the cubs produced look like domestic pigs instead of wild boars. Therefore, the special wild boar with binary hybridization should not be reserved for seed use. If limited by conditions, when special wild boar is not used as breeding boar, three-way hybrid special wild boar with more than 70% wild boar blood relationship should also be selected as breeding pig, and inbreeding should be prevented in blood relationship, so that its offspring have strong disease resistance and grow rapidly. At present, Congjiang Xiang pig, a special pig in Guizhou, is famous, and its small size is suitable for being a roast suckling pig or a pet pig of urban people. It is worth the choice of the majority of foster households; But we must choose a suitable place as a place to start stocking. Breeding pigs and overweight wild boars used to be wild animals, which mainly feed on leaves and weeds, but this characteristic has also been retained under artificial feeding. 60%~70% of the feed is mainly green feed such as grass and vegetables. However, some farmers use the experience of raising pigs to feed wild boar with complete feed, which not only greatly increases the cost, but also causes the boar to be overweight and overweight due to the lack of limited feeding in the early growth of reserve breeding pigs and the high nutritional level in the diet, which makes it difficult for boars to climb over or sows to stand the boar's climb over, which leads to the difficulty or abnormal breeding. At this time, we should limit the feeding of wild boars, take green feed as the staple food, and strengthen exercise at the same time. Prevention and treatment of epidemic disease Foot-and-mouth disease is an acute infectious disease of cloven-hoofed animals such as pigs, cattle and deer, which mostly occurs in late autumn, winter and spring, and its virus often spreads at a speed of more than 10 km per hour. The occurrence of foot-and-mouth disease in Britain has caused serious losses, which should arouse our vigilance. 1 Clinical characteristics The sick pigs have an appetite, listlessness and a body temperature of 40-4 1 Celsius. The diseased pig's oral mucosa (including tongue, lips, gums, pharynx and palate), hoof crown, toe and heel appear redness, slight fever, sensitivity, blisters and ulceration of the nose plate, breast and skin, etc. After the blisters burst, they form hemorrhagic rotten spots, which can heal themselves in about 7- 10 days. If there is bacterial infection, it will be cured. Usually, blisters and rotten spots are rarely seen, showing acute gastroenteritis and myocarditis and sudden death. Anatomy shows myocardial degeneration, which seems to be boiled in water. Its section is grayish white and light yellow stripes, and thigh muscles are necrotic. 2. Preventive measures 2. 1 In late autumn, winter and spring, the thermal insulation measures for pigsty should be strengthened, and pigsty and sports ground should be strictly disinfected regularly. The common disinfectant is mixed with potassium permanganate and vinegar. It can also be sprayed with caustic soda solution. 2.2 Pay attention to strengthening quarantine at ordinary times, and isolate the epidemic immediately when it is found. If there is an epidemic in this area, besides taking emergency measures for the whole herd, we should also strengthen nutrition for the herd, improve the overall physique, and enhance the ability of disease prevention and treatment, and preach and teach to solve doubts! 3450 1 1729 Liujianbogzjp
5 2.3 Strengthen the close contact between animal husbandry and epidemic prevention stations in a county and city and nearby veterinarians, get timely epidemic feedback, and inject vaccines in advance for epidemic prevention. The dosage and usage of inactivated virulent swine vaccine or attenuated swine vaccine B are in accordance with the instruction manual (produced by Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences). It is worth mentioning that the virus type of the vaccine used must be consistent with the virus type of foot-and-mouth disease prevalent in this area, otherwise the occurrence and epidemic of foot-and-mouth disease cannot be prevented and controlled. It is best to inject the vaccine twice. When using the vaccine, first inject a pig according to the specified dosage, and after 1 hour, inject the vaccine into the whole group of pigs when there is no abnormal performance; Preventive injection should stick to one needle per pig. When the vaccine is pumped into the syringe and exhausted, it should be placed in a rubber-covered bottle, not in the air. The original vaccine bottle should not be thrown away casually, but should be burned and then thrown away. After preventive injection, the syringe and needle should be soaked in disinfectant such as Baidusha for two hours and boiled at high temperature, and then rinsed with clear water for later use. 3. Treatment method 3. 1 After the symptoms of pig foot-and-mouth disease are found, Immediately remove the bedding grass in the circle, strictly disinfect it, and replace it with thick and short bedding grass or clean the fresh soil layer without bacteria. 3.2 It is found that piglets are suffering from foot-and-mouth disease, and they can be treated with high immunity at the initial stage, with a dose of 2 ml per kilogram of body weight. Intramuscular injection or subcutaneous injection. 3.3 Wash the mouth of sick pigs with vinegar or 0. 1% potassium permanganate. The rotten surface can be coated with 1%-2% iodine tincture glycerin mixture. The hoof can be washed with 3% Lysol. After drying, apply fish fat ointment or zinc oxide cod liver oil ointment. 3.4 Glutaraldehyde (Koukexing) can also be used for intramuscular injection treatment of pigs suffering from foot-and-mouth disease (produced by Wuhan Organic Industry Co., Ltd. at Gongren Road 10, Yankou District, Wuhan). 3.5. Treat sick pigs with immune enhancer "Foot-and-mouth disease" (developed by Professor Lin Gan of Shandong Academy of Agricultural Sciences). Usage: Inject it every other day. Every 5 kg body weight is injected 1 ml, and it can be cured after 3-5 times of continuous administration. The drug can also be injected into pregnant sows, but it should be accompanied by (according to the specified amount) intramuscular injection of progesterone. It can also be treated by intramuscular injection of Dute 2000 and Koukang Injection (produced by Shijiazhuang Expedition Veterinary Drug Factory, Hebei Province), with three days as a course of treatment and two courses of treatment. Once erythroderma of wild boar can be cured, Diagnostic symptoms: sudden onset, sick pigs eat less or lose their appetite, and their body temperature is 40 ~ 42℃. At the beginning of the disease, the skin on the head and face was red, and the whole body was red after about 6 ~12 hours. A few medical records showed rash, dyspnea and abdominal breathing. Limbs weakness, occasional swelling, forced exercise, limping, prone to lying on the ground, constipation in most medical records, little and yellow urine, high mortality in acute medical records, rash on the skin. Prevention and treatment measures: 1, acupuncture therapy: the whole body of the affected pig is washed with warm soap for several minutes, and then washed with warm water. After wiping the skin with a swab, the pig's back is scraped from front to back with the back of a knife, first light and then heavy, repeatedly until the whole body is hot, and then the pig's tail and ears are pulled by hand successively, and the tail tip or ear tip is put with a round needle or a sharp knife respectively. This method is used at the beginning of the disease, and the earlier the better. 2, western medicine therapy: generally available antipyretic and analgesic drugs, in order to control complications, antibiotics can be used. 3. Chinese medicine therapy: ① Gypsum 30g, Flos Lonicerae15g, Fructus Forsythiae15g, Flos Chrysanthemi Indici15g, Radix Bupleuri10g, Fructus Arctii10g, dried tangerine peel 6g, and hay 6g, which are taken by decoction. ② Sanhua Powder: Solidago, Chrysanthemum indicum and Flos Lonicerae each15g, decocted in water and taken orally. Special wild boar is a hybrid of pure wild boar as male parent and domestic pig as female parent, which has been bred and domesticated for many times. It not only maintains the advantages of high lean meat rate, fresh and tender meat, strong disease resistance and wide adaptability of pure wild boar. Our company has been crossbreeding, breeding and purifying wild boar, and cultivated a large number of provenances with the advantages of gene stability, more litter, high meat quality and rapid growth. 1. There is a difference between "special wild boar" and pure wild boar: Practice has proved that special wild boar shows a good hybrid advantage, which not only maintains the advantages of high lean meat rate, fresh and tender meat, strong disease resistance and wide adaptability, but also changes the shortcomings of wild boar such as seasonal estrus, few litters, slow growth and difficulty in feeding. The special wild boar will be sexually mature within 0/0 month after being raised, and it will give birth to 2 fetuses every year, with at least 8 each, and as many as 14- 16. The weight of 2-month-old special wild boar can reach more than 10 kg. The growth law of special wild boar is different from that of domestic pigs, and it grows slowly in the early stage. Therefore, it is necessary for teachers to preach and teach. 3450 1 1729 Liujianbogzjp
After 6 4 months, the growth rate is very fast, and the weight can reach 75-90 kg in 6-7 months. Second, the "special wild boar" is worth developing: it is between pure wild boar and domestic pig, with more fiber and some meat similar to beef, mellow and tender meat, rich game, lean meat rate as high as 80% (only 3 1.5% for domestic pigs and 50%-60% for ordinary lean pigs) and low fat content (only for domestic pigs) Special wild boar staple food pollution-free weeds, sweet potatoes, etc., are stocked in farms that are not polluted by industry, and fully have the function of green ecological food. Advantages of developing "special wild boar" breeding: 1, good meat quality and high nutrition: special wild boar has gradually become a substitute for domestic pigs and a new type of green health food because of its low fat, high nutritional value and rich game, and the market is very tight at present. In particular, Guangzhou, Hong Kong, Shanghai, Beijing, Shenzhen and other large and medium-sized cities have great demand and optimistic prospects. In Guangzhou Xinyuan Wildlife Trading Market, the gross wholesale price of special wild boar is currently 40 yuan/kg, and it is still very popular from March to April in 2007, when it was as high as 50 yuan/kg. 2. Strong disease resistance and low cost: wild boar is not easy to get sick, and can escape even if its limbs are broken when it is hunted in the wild and survive for a long time in the harsh environment in the wild. It is extremely resistant to coarse food, and its staple food is cassava, corn cob, leaves, stems, sweet potatoes, roots, grass, pumpkins and other feeds, which are everywhere. And the daily feed is only 1/3 of that of domestic pigs, and the feeding cost is extremely low, and the input-output ratio is1:3, while that of domestic pigs is1:0.15. 3. High benefit and good prospect: the weight of adult wild boar 100 kg-150 kg, based on the current price of 25 yuan -50 yuan/kg, the output value is at least 1250 yuan-2,500 yuan, and 1 head of wild boar is equivalent to the price of seven or eight pigs, so the profit is considerable. In recent years, the pig market has been weak, and the sales price has been falling continuously, which has led to the closure of many pig farms. Pig production has entered a "meager profit era" with high cost and high risk, and it is extremely cyclical, and it will lose money if it is a little careless, but it is still cultivated by every household in rural areas. Wild boar has high price, strong disease resistance, wide source of feed and low cost, which is a good project for farmers to get rid of poverty, re-employment of laid-off workers and conversion of enterprises and farms. The popularity of special wild boar market brings enlightenment and new dawn to the plain pig breeding industry. Fourth, special reminder: the breeding technology of special wild boar is becoming more and more mature and the market is becoming more and more standardized. Farmers should take a long-term view, engage in large-scale breeding, build breeding pig farms with the approval of relevant departments, have a strict system of eliminating and selecting breeding pigs, establish independent files of breeding pigs, strictly control epidemic prevention, and take the road of game market and deep processing of products. In addition, relevant departments must strengthen management and purify the provenance market. In the special wild boar breeding industry, many farmers only know that it has less investment, high profit, flexible management and is beneficial to family breeding, but they don't pay enough attention to the problems of provenance risk, lack of experience and technology or immature technology. This situation appeals to many farmers' eagerness to get rich, which leads to the blind launch of special breeding projects. Therefore, farmers' friends should have a correct understanding of special wild boar breeding, and should pay attention to the following points: 1, to distinguish the truth from the truth, to prevent some farmers from exaggerating false propaganda and to be vigilant. 2. Farmers must receive training and learn technology. Although the breeding technology of wild boar is not complicated as a whole, and there are many similarities with domestic pigs, there are still some technical requirements for breeding wild boar. Farmers must receive training and master the technology before introducing and breeding. 3. Introduction should not be cheap, but should be introduced by regular farmers with strong capital and technical strength, high personnel quality and good reputation, and in order to avoid inbreeding, it is best to introduce more than 10 (2 males and 8 females) at a time.