How should bursitis be treated in chickens with infection?
Recently, longxiang pharmaceutical technology department continues to receive the problem of bursitis in free range chicken farms, this disease, due to the scale of the breeding industry for many years of vaccine immunization, in large farms have rarely seen such cases, free range base because of vaccine immunization is not in place, or disinfection is not thorough, occasionally appear bursitis bursitis, thus, Longxiang Animal Pharmaceutical Technology Department specially sorted out the information about chicken bursitis for the reference of the majority of free range chicken farms.
First, let's understand what is chicken bursitis?
1. Infectious bursals in chickens, also known as contagious supra-luminosclitis, is an acute and highly exposed infectious disease caused by bursitis virus.
2. The causes of chicken bursal disease are manifold: the interference of maternal antibodies; the difference between the resistance of virus strains and vaccines; improper immunization methods; the impact of drugs and feed additives; incomplete disinfection; excessive concentration of feed farms (households), and man-made spread of epidemic diseases.
Second, secondly, let's understand what are the clinical symptoms of chicken bursitis?
1. The disease only occurs in chickens, and its susceptibility is related to the development stage of bursal sac, which is susceptible to 2-15 weeks of age, of which 3-5 weeks of age is the most susceptible, and adult chickens with degenerated bursa are only recessively infected.
2. The disease can be infected through the respiratory tract, digestive tract and eye conjunctiva, often showing a sudden outbreak, rapid transmission, the incidence rate can reach 100%, the mortality rate can reach more than 30% in the new epidemic area, and in the old epidemic area generally not more than 5% /
3. The peak of death usually occurs 2-3 days after the onset of illness, begins to decrease on the 4th day, and can stop dying after 1 week. The onset of this disease is often followed by coccidiosis and E. coli disease.
4. The chickens have white loose stools at the beginning of the disease, and as the disease worsens, the neck feathers of the sick chickens are fluffy, the cold is crowded, the ground is sleepy, the gait is unstable when walking, the body is trembling, the white feces are polluted around the anus, the late stage of the disease is dehydrated, the feet and skin are dry, and finally die due to exhaustion.
Third, once again, let's understand what are the autopsy lesions of chicken bursitis disease?
1. The virus mainly affects the bursa. At the beginning of the disease, the bursay is large, and the atrophy is atrophy in the later stage, and the yellowish gel sample under the surface serous membrane is characterized by it; sometimes the bleeding of the entire bursa is purple grape-shaped; the milky white viscous or cheese-like contents can be seen when the bursa is cut open, and the mucous membrane is punctuated;
2. The pectoral muscle and femur muscle are bleeding in strips; the bleeding of the glandular gastric mucosa is flushed, and the mucous membrane at the junction of the glandular stomach and the muscular stomach has bleeding spots, which are slightly banded, but the glandular and gastric papilla has no bleeding spots.
3. The kidneys are enlarged and obvious, and there are urate deposits in the ureters on both sides, commonly known as "spotted kidneys".
4. How to treat bursitis in the chicken farm? Let's take a look at:
1. Strict disinfection of chicken farms
Chicken farms should also strengthen management, do a good job in hygiene and disinfection, prevent the disease from being brought into the chicken farm, and once the disease occurs, deal with the sick chickens in time and carry out thorough disinfection. Disinfection can be selected "povidone iodine" or "dilute glutaraldehyde" every 2 to 3 weeks, but also to minimize the entry and exit of people and vehicles to prevent the spread of disease.
2. Improve immunization procedures
Because many free-range chicken farms have been using the immunization program of chicken bursal disease (14 days old, chicken bursal disease medium virulence vaccine 1 part of each chicken drinking water; 24 days old, chicken bursal disease medium virulence vaccine 2 parts of water per chicken; 40 days old, chicken bursal disease medium virulence vaccine 2 parts of drinking water per chicken), still can not control the occurrence of the disease, even the incidence of 100%, and mostly occur at about 30 days of age, the mortality rate is between 10% and 25%, and the mortality rate in severe cases reaches more than 60%. Those with high mortality rates are mostly acute, and the mortality rate is the highest in the first three days of onset, and it is too late to treat, and the economic losses are very serious. Practice has proved that the above immunization program has lost its immune effect on the chickens and needs to be improved urgently.
Through repeated studies, improvements and trials, the immunization program for bursal disease in chickens was changed to four immunizations
At 6 days of age, chickens with medium virulence vaccine for bursal disease 1 serving of water per chicken;
14 days old, chickens with a medium virulence vaccine for bursal disease 2 servings of water per chicken;
At 24 days of age, chickens with a medium virulence vaccine for bursal disease drink 2 servings per chicken;
At 40 days of age, the medium virulence vaccine for chicken bursal disease is 2 servings of drinking water per chicken, which can effectively prevent the occurrence of chicken bursal disease.
3. Treatment measures for sick flocks:
When chicken bursitis occurs in chickens, the sick chickens should first be isolated and thoroughly disinfected the chicken coops, flocks, and grounds where the disease occurs;
If the disease occurs during the brooding stage, care should be taken to increase the temperature of the brood to minimize the mortality of the chicks. At the same time, reduce the protein content in the feed and increase the vitamin content, which can last for 5 to 7 days.
For sick chickens in the early stages of disease, infectious bursal disease high-free egg yolk liquid injection can be used to quickly reduce symptoms. At the same time, the use of liver protection and kidney protection products "liver and kidney health" drinking water, accelerate the recovery of the phenomenon of renal swelling, the selection of E. coli special drugs without antibiotic ingredients, to prevent secondary infection of E. coli, conditional in 7 to 10 days, re-inoculation of bursa weak vaccine, can greatly improve the resistance of the chicken population bursal disease.