Core Tip: The arrival of winter, the sudden change of the environment, the non-circulation of the air. In pig farms, pigs with cough and gasping symptoms often appear. There are many diseases with this type of symptoms. How can we distinguish them? The following statements are made about several diseases that are often confused.
One, pig gasping disease
Also known as swine endemic pneumonia and swine mycoplasma pneumonia are chronic respiratory infections caused by Mycoplasma hyopneumoniae. Cough and gasping are the main symptoms. Pigs of various breeds, sexes and ages can occur, but nursery pigs, just weaned pigs, and sows in late pregnancy and lactation are more prone to occur, and adult pigs are mostly chronically infected. If the weather becomes cold and the environment is harsh, the sick pigs who have lost their clinical symptoms will also show clinical symptoms. The disease has caused great harm to large-scale pig farms and caused serious economic losses.
Early onset occurred in 2 to 3 weeks old pigs (earliest at 9 days of age), but the onset was slower and infection was more common at 6 to 10 weeks of age. Many pigs developed symptoms at 3 to 6 months of age. The lower the temperature, the easier it is to develop the disease.
The incubation period for clinical symptoms is as low as 1 to 3 days and as many months. There was no significant change in body temperature, appetite, and mental health in the early stage of the disease, and the symptoms were obvious with the development of the disease at the later stage. The main symptom of early onset (especially piglets) is coughing, which occurs most often in the early or late feeding or during exercise or during sudden changes in the weather. Cold air is more likely to irritate or drive or feed. Mostly vocal dry cough, while a small amount of viscous nasal or purulent nasal discharge. As the disease progresses, the cough is more severe and the number of times increases, turning into a wet cough. The sick pig stands still when he coughs, arches his back and stretches his neck, and his head dangles to the ground until the respiratory secretions cough up or swallow. In the mid-stage of the disease, the sick pig gasps, the abdominal wall has a rhythmical movement, breathing 40 to 70 times per minute, and up to 100 times in the later period. The symptoms of piglets are more severe. In the later period of illness, the sick pig gasps and breathes quickly. It is a dog sitting posture, breathing in his mouth, his expression is very painful, and the cough is long and deep. It seems that there is a secretion that obstructs the respiratory tract, it is difficult to cough, and the purulent nose juice and mouth foam , Spiritual delay, loss of appetite. The disease generally does not cause death, but the feed rate and growth rate are severely affected.
Second, influenza
Obvious seasonality occurs mostly in autumn and winter and spring when the temperature suddenly changes. It is especially prone to sudden outbreaks in wet and rainy conditions. It spreads rapidly and can spread throughout the entire group within 2 days to 3 days. The temperature of the diseased pigs rose to 40°C~41.5°C, and the course of disease was short (about 1 week). The spirit was depressed, the appetite was diminished or did not eat, and the entire pig group was rapidly infected. Muscular pain, reluctance to stand, rapid breathing, coughing, and sticky fluid from the eyes and nose. If there is no secondary disease, it can often heal itself in a week or so. The epidemic period is short. The pigs suffering from panting are not warm, have a long course of illness, spread slowly, and have a short epidemic.
Third, the pig lung disease
Acute cases of swine pneumoconiosis are mostly septicemia and fibrinous pleuropneumonia symptoms. The systemic symptoms are severe and the duration of the disease is short. The sepsis shows symptoms of sepsis and fibrinous pleuropneumonia. The chronic cases have variable body temperature, heavy cough, light breathing, and severe weight loss. At the time of examination, there were purulent or necrotic lesions of different sizes in the liver. There was no major change in body temperature and appetite in puffed pigs, and there were no changes in sepsis and pleurisy in the lungs.
IV. Contagious pleuropneumonia
Pigs suffering from contagious pleuropneumonia have elevated body temperature, severe systemic symptoms, and pleurisy symptoms at the time of necropsy. Pigs suffering from panting were not warm, had mild or asymptomatic symptoms, and had pancreatic changes in their lungs without pleurisy lesions.
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