After the chicken is vaccinated, it is still sick.
In recent years, infectious bursal disease has become one of the most important infectious diseases that threaten the chicken industry. The disease has become anemic, aggressive, spreads quickly, and is very ill, often causing major economic losses to chicken production. In particular, the majority of chicken farmers suffer from headaches. A large proportion of the chickens that contracted this disease were immunized once or twice with Inactivated Bursal Disease. Therefore, some chicken farmers have a problem with this phenomenon because they mistakenly believe that they are producing vaccines, and even have disputes with the veterinarians who requested them. In fact, the occurrence of this phenomenon is not necessarily a question of the quality of the vaccine or the method of epidemic prevention. There may be other reasons. According to the actual situation in the work, a comprehensive analysis is as follows:
The reason why the vaccine was vaccinated
Vaccination time is not suitable
It is understood that some chicken farmers know little about the knowledge of maternal antibodies in the chicks they purchase, and they don’t care much; some farmers even pay more attention to the problems in this area, but they are also interested in Whether or not the breeder had inoculated with the inactivated vaccine against the bursa of eggs prior to egg production (especially grass eggs hatched from the soil), it is unclear whether the parental antibodies were purchased from chicks. In this way, it is difficult for farmers to determine the exact time of vaccination. A considerable number of chicken farmers have blindness when they are vaccinated, and their immunization effects may be inaccurate.
If the time of vaccination is too early, the maternal antibodies in the broilers will be neutralized. If these chicken vaccines are neutralized, they will not be immune and will develop; if the vaccination time is too late, the maternal antibodies in the chicks will be low. , it may have been infected by a virus before vaccination. Therefore, some chicken farmers have vaccinated their broilers with bursal inactivated vaccines; however, infectious bursal disease may still occur due to inappropriate timing of inoculation.
Incorrect use of vaccine
In recent years, commonly used methods of inactivated Bursa vaccine are generally used in two ways: one is mixed in water for inoculation by drinking water; the other is for immunization by drip serving. Some chicken farmers will confuse the two methods, and often plan to save time, change the vaccine that should have been inoculated with inoculation into drinking water, because of improper use of the vaccine resulting in immune failure; In addition, some chicken farmers use the method of vaccination with drinking water Correct, but the use of tap water with disinfectant, or the use of metal drinking fountains, or improper water stoppage time, or vaccine drinking time is too long (more than two hours), resulting in reduced vaccine potency, thereby affecting the immune effect .
other reasons
Due to environmental pollution and poor disinfection, the implementation of the feeding and management system is not strict, resulting in the occurrence and spread of this disease. In addition, some farmer's chickens are too dense, poorly ventilated, there is mildew in feed, nutritional standards are reduced, and incomplete vitamins and trace elements can also induce bursal disease.
If the used bursal inactivated vaccine strain is not consistent with the local antigen, the correct immunization will not achieve the goal of immunization and the chicken may still develop the disease.
The appropriate time and method of vaccination
For young chickens that have low maternal or maternal antibodies, immunization with the inactivated Bursa vaccine should be carried out as soon as possible. Each chick can be inoculated once at 1 to 3 days of age and at 10 to 14 days of age.
For already known chicks with high maternal antibodies, the time for vaccination may be delayed. The first immunization should be performed at 18 days to 21 days of age, and the second immunization at the age of 26 days to 28 days.
For broiler breeders with mutated maternal antibodies, a medium-vial vaccine can be used. Once the chicks are 14 days old and 21 days old, they are vaccinated one at a time.
In heavily contaminated and often diseased areas, vaccination should be performed at the fifth week of chicks to enhance immunity.
Remedy after onset
In the case of strengthening feeding and management and strictly implementing the health and epidemic prevention system, if bursal disease still occurs, the following remedial measures may be taken:
Urgent vaccination. Once the disease has been diagnosed and diagnosed, the medium-disease Inactivated Bursal Disease Virus vaccine can be used for emergency inoculation by doubling the amount of drip or drinking water at the beginning of the disease.
Isolation of diseased chickens and rapid and effective treatment. For the early onset of pathological conditions, compound norethindrone (oral contraceptives I or II) can be taken, one for each chick, one for each chicken, and double the amount of multivitamins and antibiotics in the feed. (such as erythromycin), while drinking water with oral rehydration salt for 5 days to 7 days; can also be injected high-protection egg yolk or serum, or with some traditional Chinese medicine adjuvant therapy.
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