The pig farm has to make blue ear purification, how do you choose? – Pig Pig School – China Animal Human Website – A useful animal husbandry website

Pig Professional Manager, WeChat ID: Yzzyjlr2016

Pig breeding and respiratory disorder syndrome is a breeding of sows caused by propagation and respiratory disorder syndrome (PRRSV) Viral infectious diseases with difficulties in dysfunction and piglets and high mortality are main characteristics. The pig is the only animal that is infected with the virus and clinical symptoms.

Pig breeding and respiratory disorder syndrome, or more popular title “blue ear disease”, is still one of the main diseases in the pig industry. The disease was first discovered since 1980, and it has been continuously discussed, studies and research in decades. Due to the mutation speed of the virus seems to be more difficult than the discovery solution, the management and control of blue ear disease is still the most difficult to operate.

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The hair follicle bleeding point is dense, the needle tip (Figure 4-141); the back skin is densely milled rust color or blue purple bleeding point (Figure 4-142)

blue The outbreak of the ear will bring huge economic losses to the pig farm. These losses may be reflected in breeding disorders: high yield, early childbirth, increased weakness, and delayed estrus, these will reduce the reproductive performance of the sow;

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Reflected as a respiratory disease in the conservation period: cough, pneumonia, secondary infection with vice pigophilus and streptotic diseases. Research on N.Gabier, USA, USA, N.Gabier, found that blue ear disease affects growth-fattening stage, so that growth rate is close to 20%, of which the feed volume decreases by 7%, and the feed utilization is 15%, and each pig cost is increased. 14 US dollars / 87 yuan, the fattening period is 25 days. Another study (Holtkamp et al., 2013) assessment, American pig producers are due to blue ear diseaseThe loss caused by a year can reach 664 million US dollars or 4.12 billion yuan (RMB), which is in the case where the vaccine is generally used.


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In order to manage and purify the blue ear disease in the pig farm, we must understand the natural attributes of the virus. The pathogens of blue ear disease are RNA viruses. This viral mutation rate is fast, so it is difficult to develop a valid vaccination for all infected farms or regions. Studies have found that weakened viral live vaccines will have a poison rebate (Neilsen et al., 2001), some vaccines may actually lead to a variety of blue ear disease in the industry. This virus can also initiate long-term viral blood, and infected pigs will continue to detoxify 60-100 days. The virus can also be discharged through nasal secretions, semen, urine, feces, emilings, etc., and may continue to survive 200-250 days in the tissue. Infected marshal can transmit viruses to piglets, and these piglets are constantly detoxifying to the outside, until they are transferred to the purse. These viruses can survive for a long time in a frozen environment.

PIC Management and Maintain a lot of blue-earlier negative farms, and assist many farms to implement blue-ear sick purification procedures. Regardless, when the farm requests us to provide blue ear disease purification support, we will propose two questions before the execution: First, if we successfully purify the blue ear disease in your farm, you can keep blue ear disease. Negative? This means that everyone in the farm has biological safety awareness to prevent virus invasion. Do you strictly control the transport truck in the farm? Biosafety is not just a farm manager or a veterinary responsibility. All the staff of the farm include the chef, guards and other coordination teams must have this consciousness. Before entering the production area, only one hundred people forget to replace clothes or bathes, they can bring the virus into the pig house, although there is a cost of tens of thousands of fees in the fence, bathroom, air purification system; Second, have you continuously provide a seed source of blue ear disease negative breeding pigs, that is, the reusing sow, boars and semen? We ask these because we have a way to successfully purify blue ear disease. IfAfter the purification is successful, due to the difference between biological safety, or the cause of the source of the disease, the cause of the disease from the source of other fields, is that all our operations are actually futile.

Focus on whether it has execute. Can you do the true purification of blue ear disease? The answer is very affirmative. It is best to choose completely cleansing / remove all pigs, cleaning, disinfecting, with blue ear disease negative seed pigs, which is the simplest, easiest, fastest, safest, lowest risk, but due to expensive cost Not all farms to choose this method. Other feasible methods are closing groups.

Theoretical basis for gradually (partial) clearing / building group purification Blue Purnel

Theoretical basis for gradually cleaving / building group: The blue-ear virus carried in the individual pigs will gradually die over time. If the virus cannot find a new individual infection and complete the copy, the detoxification process ended. Pigs infected with early infection and rehabilitation produce immunity to the same strains. Through the gradual cleaning of the group / built group, it is not easy to operate, there are some simple principles, although the implementation is not easy:

1, introduced a replacement of blue ear disease after negative
2, enabling the immunity of the mother pig group in a stable state

3, the production of blue ear disease negative piglets

4, transfer blue ear disease negative pigs Poster and fattening house

Sour of sow stabilization / introducing blue ear disease negative rear mother pig

, we need to perform synchronous execution. The previous discussion: I hope that the virus will gradually die in the farm, meaning that there is no new individual by viral infection, which will accelerate the purification of viruses. Immediately introduce the same reserve pigs, used for production arrangements after farm closed. Therefore, from the date of close the closure, new pigs will not be transported within 200 days, which requires a reserve sow that introduces a large age span. We will drive the infected pigs to the farm, the unwind to the farm, so that all the pigs of the farm are infected, through a good adaptation procedure, ensuring all resell pigs contact viruses.

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Weaned blue ear disease negative piglets

After a period, we pass the laboratory PCR technology to diagnose new weaknesses still have a poisonous blood. After we determine that new piglets or weaning PCR detection is negative, these pigs can be transferred to clean and disinfection.
Transfer of blue ear disease negative pigs to the booster and fattening

For multi-point feeding production systems, the conservation unit is distributed in different regions, and we only need to continue to wean continuously. Pig turns out of the farm. However, the conservation unit and the mother pig unit are situated together, we need to build a gaze, such as stopping the breeding within 1 month, or moving the sow of the pregnancy out of the farm, or turning a moon to the outside. Regular monitoring blue ear disease virus, judge the health of the sow. All sow PRRS antibody positive, indicating that the mother pigs are stable; diagnosis of virgin blue-ear disease antibody in post-occupation, indicating that the purification of viruses has been successful. These mean that these piglets have not been infected by viruses under the conditions of loss of maternal antibody protection.

In a serological diagnosis of at least 4 months, piglets are negative, and this farm can be called blue-earlier negative farms. All early infected sows out of the sow, long (at least 2 years) all diagnostic tests were negative, and some have called such a farm is a true blue ear disease negative field.

We want to keep in mind: Blue-ear virus is prone to mutation. Regardless of whether the farm’s sow is immunized to the latest outbreak of blue ear disease, or the farm has been replaced and all pigs are blue and negative, these farms are still vulnerable to different viral strains infection and burst blue ear. disease. This means: We must ensure that the biosafety procedure is performed, protect our farm.

In the future, the pig industry requires vaccines to more effectively resist blue ear disease, this type of vaccine will have cross-protected effects on existing blue-ear viruses and future mutations. It is well developed with labeled capacity to distinguish the immunization of vaccine and infected animals. The construction of the new pig farm should carefully consider two-point feeding, three-point feeding system, the mother sow house, pregnancy, cocktail and purse, fattening house, when the disease is required, management More convenient and controlcarried out. Carestation and fattening houses are usually a water storage and source of sows infected with blue ear disease. For a single-style pig farm, close, the implementation of the program is almost consistent. If there is an immunization plan, while the surrounding farm uses the same vaccine, it can help reduce mutations, reduce the opportunity of new viruses.

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This industry hopes to have always trustworthy products and programs to thoroughly control blue ear disease, but this still takes more than a year or decades of research to defeat blue ear disease. . Therefore, the best way to control blue ear disease is to purify it, so that it does not exist within your farm. But the task is very difficult.
Data Source: PIC China

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