Experience of using drugs for respiratory diseases in chicken in winter and spring
There are many causes of respiratory diseases in chickens, which can be divided into non-infectious and infectious causes. Starting from Cold Dew every year, the temperature difference between day and night increases, and most farmers reduce ventilation time in order to keep warm, coupled with unreasonable chicken house design and unreasonable vaccine immunity and other factors, respiratory diseases have perplexed the majority of farmers for a long time.
Analysis of the cause of disease
The breeding and management of the chicken house is poorly ventilated. The concentration of harmful gases such as carbon dioxide exhaled by chickens, ammonia and hydrogen sulfide produced by feces, and carbon monoxide produced by incomplete combustion of coal increases, while the concentration of oxygen decreases. Chickens in this environment for a long time will suffer damage to their respiratory system. Ammonia and hydrogen sulfide gas can inflame the conjunctiva and tracheal mucosa of chickens, making pathogens easily invade the respiratory system and cause disease, while carbon monoxide can cause poisoning in chickens; the dust caused by drying cushion carries a large number of pathogenic bacteria such as Escherichia coli, which is easy to cause colibacillosis when the concentration is high or the resistance of the body decreases. If a moldy cushion is used, a large number of mold spores are scattered in the air and cause aspergillosis after being inhaled by chickens. Environmental factors such as high feeding density and high or low climate temperature in chicken sheds can interact with infectious respiratory pathogens and aggravate the symptoms of respiratory diseases.
Infectious pathogen
The main viral pathogens are avian influenza (orthomyxovirus), Newcastle disease (paramyxovirus), transmission branch (coronavirus), throat (herpesvirus) and so on.
The main bacterial pathogens are infectious rhinitis (Haemophilus) and Escherichia coli.
Other pathogens mainly include slow call (mycoplasma) and aspergillosis (aspergillosis).
Other pathogens interfere with respiratory diseases, in addition to bacteria, mycoplasms and viruses, there are also diseases that cause immunosuppression, such as Marek's disease, infectious anemia, infectious bursitis, reticuloendotheliosis, subtype leukemia, reovirus disease and so on, as well as adverse environmental factors, aggravate the pathogenic effect of pathogens on respiratory tract.
Diagnosis, prevention and treatment of common respiratory diseases
Avian influenza (orthomyxovirus)
Differential diagnosis of the epidemic characteristics, symptoms and pathological changes of the disease is similar to that of Newcastle disease. at present, the incubation period and course of Newcastle disease in China are longer than that of avian influenza, dyspnea, oral effusion and cooing sound of Newcastle disease. typical neurological symptoms and routine typical lesions are more obvious and characteristic than avian influenza. The diagnosis can only depend on the laboratory diagnosis.
Pay attention to the differences with transmission branch, throat transmission, nasal transmission, mycoplasma disease, chlamydia trachomatis, egg drop syndrome, etc., according to their epidemic characteristics, symptoms, case autopsy and laboratory examination.
Secondary or concomitant bacterial disease can be determined by pathogen isolation.
Prevention and cure measures
All poultry in the diseased group were culled, and the uninfected chickens in the surrounding area were urgently immunized with H9 and H5 avian influenza vaccines.
Control of secondary infection.
- Prev
It is the right time for geese to be fattened in autumn
The weather in autumn is cool, the grass is exuberant, and there are many by-products after autumn harvest, which is the best season for fattening meat geese. During this period, after 20 ~ 25 days of fattening, geese can generally gain 1.5 kg ~ 2.2 kg. The meat hybrid breeds such as Shitou goose and Xupu goose, which are more than 70 days old, lively in spirit, bright feathers, good at foraging, healthy and disease-free, should be selected. Fattening method ① grazing and fattening. Drive the geese to the harvested field during the day to feed on the remaining ears, grass seeds, etc., and feed them after they return home at night.
- Next
The best epidemic prevention procedure for chickens
1. Before eating, the chicks were sprayed with streptomycin or nasal drops of 2000-4000 units each to prevent respiratory diseases. At the age of 2.1 days, the turkey herpesvirus vaccine was injected subcutaneously with 0.2 ml solution to prevent Marek's disease. 3.3-day-old drinking water with 0.01% potassium permanganate to prevent digestive tract diseases. At the age of 4.5 days, chopped garlic was mixed into the feed for chickens, or half a piece of ground oxytetracycline was added to every kilogram of feed for 7 days to prevent white dysentery in chicks.
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