Entering the winter, various places have successively reported an increase in respiratory diseases in birds, purring, nose flicking, neck extension breathing, easy to repeat in the treatment process, accompanied by a small number of deaths. Autopsy tracheal flushing has mucus, the lungs are either dark red and some are black, which is what we often call "black lung disease".
01
Chicken black lung is mainly caused by the following points:
1. Virus or infection, so that the chicken has lung disease, the initial congestion of the disease, and then the lesion necrosis;
Second, caused by environmental factors, excessive density, humidity is too small or too large, poor ventilation, high harmful gas content will also cause respiratory lesions. In the early stage, the unilateral lung is red, the lungs are black and purple, and as the disease worsens, slowly both sides of the lungs are black and purple, resulting in death.
Third, pneumonia caused by cold stress colds, which is the main cause of black lung. With the drop in temperature, the decrease in humidity, the increase in the rate of management errors, the change in body temperature is too large, the appearance of cold symptoms, if found in time, delay the best treatment time, it will be secondary to pneumonia, air cystitis, and even blockage of the lungs.
Symptoms and manifestations of black lung disease in chickens:
The pathogenesis of black lung disease: in the early stage, one side of the lungs is red, the lungs are black and purple, and as the disease worsens, slowly both sides of the lungs are black and purple, resulting in death.
The following rules of clinical onset can be referred to: 1 day old to 15 days old: bubbles in the balloon, 15 days old to 25 days old: there are air bubbles in the air sac, there is mucus in the trachea, there may be blockages, unilateral blackening of the lungs, 25 days old to 30 days old: unilateral lung black aggravation, 30 days old to 35 days old: both sides of the lungs black, 35 days old - 40 days old: both sides of the lungs black aggravation.
Chicken black lung is a symptom, so for such a situation, we must first find the cause, see what kind of disease the chicken has, and then carry out symptomatic prevention and control of pathogens to treat the sick chicken. At the same time, we must pay attention to increasing the amount of ventilation while ensuring the temperature.
03
Prevention and control measures of black lung disease in chickens:
1. Optimize the environment of the chicken coop.
In the production process, according to the chicken group sense state combined with the actual environment in accordance with the temperature, humidity, ventilation, ventilation standards to manage, to give the flock a comfortable and healthy growth environment.
Chickens raised in a ammonia concentration of 10 mg/L or 20 mg/L increased tracheal mucus secretion, rough cilia surface, degeneration of their mucosal ciliary movement, decreased elimination rate of E. coli by air sacs, liver and lungs, and increased susceptibility of chickens to infectious bronchitis and Newcastle disease if E. coli pneumonia occurs. This shows the importance of the environment to the flock.
2. Find the cause of the disease, and treat the symptoms with symptomatic prevention and control.
Only by finding out the cause, diagnosing the disease, and using reasonable symptomatic drugs can we achieve the desired treatment effect. Common pathogens that cause lung infections are: E. coli, staphylococcus, mycoplasma, mold, H9, infectious bronchitis, pneumovirus, nasal tracheal ornithella and so on.
Chinese medicine dialectic of black lung disease: cold invades, the heat of the lungs cannot be excreted through breathing, and the stasis forms a depression in the lungs, resulting in the lungs slowly turning black. Depression time is long, the function of the lungs will be weakened, heat discharge is more difficult, the lungs due to overheating slowly cause necrosis, edema, therefore, respiratory diseases improper treatment of poultry, in the late stage (5 days later) there will be lung blackness, edema, necrosis and other phenomena, so the treatment principle should be cool diarrhea, xuan lung asthma mainly.
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