With the change of seasons, infectious pig diseases occur frequently, let's see how to diagnose several common diseases!

In late spring and early summer, the seasons change, the climate is changeable, all kinds of epidemic diseases are high, and pigs are easy to be infected with epidemic diseases. A group of diagnosis and treatment methods of infectious pig diseases are specially arranged for farmers' reference.

The main results are as follows: 1. In pig production, pig diseases such as typical digestive tract symptoms such as dysentery are often encountered, which are caused by viral diseases, bacterial diseases and parasitic diseases. These pig diseases all have symptoms of dysentery and are easy to be misdiagnosed, so scientific identification and timely diagnosis is particularly important.

2. Yellow dysentery of piglets is an acute and fatal disease caused by pathogenic Escherichia coli. Diarrhea of sick pigs, discharge of yellow pulp dung, containing small pieces of curd, soon emaciated, coma and died. The gastrointestinal tract is dilated with a large amount of yellow liquid contents and gases, the intestinal mucosa shows acute catarrhal inflammation, and the small intestinal wall becomes thinner. It was most likely to occur in 1-3-day-old piglets, and some piglets developed the disease at 12 hours after birth, with high morbidity and mortality.

3. White dysentery of piglets is an acute intestinal infectious disease caused by pathogenic Escherichia coli. the feces of diseased pigs are milky or gray, pulpy or paste, fishy and sticky, and there is catarrhal inflammation in the intestinal mucosa. Most of them occurred in 10-30-day-old piglets with moderate morbidity and low mortality.

4. Red dysentery of piglets is a highly fatal enterotoxemia caused by Clostridium perfringens type C. bloody dysentery, short course of disease, high mortality, diffuse bleeding or necrotic changes in the posterior segment of the small intestine. The diseased pigs excreted blood samples with dilute feces containing fragments of necrotic tissue. The jejunum is dark red, the mesenteric lymph nodes are bright red, there is small bleeding at the edge of the spleen, and the kidney is grayish white. It mainly affected 1-3-day-old piglets. Piglets over 1 week old seldom developed the disease, with high morbidity and low mortality.

5. Porcine dysentery is an intestinal infectious disease caused by pathogenic porcine dysentery serrata. Catarrhal hemorrhagic inflammation occurs in the large intestinal mucosa of diseased pigs, cellulosic necrotizing inflammation, mucous or mucous hemorrhagic dysentery. The diseased pig's appetite decreases, the feces become soft, with strips of mucus on the surface, and then the feces are yellow, soft or watery, until the feces are filled with blood and mucus. The mucous membrane of the large intestine is swollen and covered with mucus and cellulose with blood clots. the content is soft to thin and mixed with mucus, blood and tissue fragments. Pigs of all ages and breeds were susceptible, but piglets at the age of 7 to 12 weeks were more likely to occur. The epidemic of the disease is non-seasonal and lasts for a long time.

6. transmissible gastroenteritis is a highly contact intestinal disease caused by porcine transmissible gastroenteritis virus (coronavirus). Sick pigs vomit, severe diarrhea and dehydration. Piglet feces are yellow, green or white and may contain undigested curd blocks. Adult pigs have vomiting and gray-brown watery diarrhea. Gastric fundus mucosal congestion, bleeding, mesenteric congestion, lymph node swelling, intestinal wall thinning and translucent. The case fatality rate of piglets within 10 days old was high, the mortality rate of pigs over 5 weeks old was low, and adult pigs almost did not die. It usually occurs in winter and spring, and the peak of incidence is from January to February.

7. Porcine epidemic diarrhea an acute contagious intestinal infectious disease caused by porcine epidemic diarrhea virus (coronavirus), vomiting, diarrhea, and dehydration of diseased pigs. Sick pigs have watery diarrhea, severe dehydration, depression and loss of appetite. The small intestine was dilated, filled with yellow fluid, mesenteric congestion, mesenteric lymph node edema, and small intestinal villi shortened. Pigs of all ages are infected, and the incidence of suckling piglets, shelf pigs or fattening pigs is high. The disease mostly occurs in the cold season, especially in December and January of the following year.

8. Paratyphoid fever of piglets is a disease caused by salmonella, with clinical symptoms such as septicemia, enteritis and abortion in pregnant females. The skin of the ear root, chest, lower abdomen and posterior body of the diseased pig was purplish red, and the feces were foul yellow or yellowish green, mixed with blood, necrotic tissue or cellulose floc. Splenomegaly, hard texture, dark purplish red, systemic lymph node congestion, swelling, mesenteric lymph node enlargement is cord-shaped. It often occurs in piglets under 6 months old, especially in 1-4 months old. The disease can occur all the year round, and it occurs more frequently in rainy and humid seasons.

There are also:

1. Identification of febrile epidemic disease with skin erythema.

(1) the pharynx is obviously enlarged, showing an acute process: porcine lung disease.

(2) pharynx is obviously enlarged, showing a chronic process: porcine anthrax.

(3) No pharynx enlargement, onset of disease of all ages, erythema finger pressure does not fade: classical swine fever.

(4) without pharynx enlargement, it is easy to develop at the age of 6 months, erythema finger pressure does not fade, erythema does not protrude the skin, the boundary is not clear: porcine toxoplasmosis.

(5) without pharynx enlargement, it is easy to develop at the age of 6 months, erythema finger pressure fades, erythema protruding skin, rhombus, square and other obvious boundaries: porcine erysipelas.

(6) No pharyngeal swelling, mostly occurred in the extremities of piglets, claudication, neurological symptoms: Streptococcus suis.

(7) No pharyngeal swelling, mostly occurred in piglets limb, terminal and skin eczema, diarrhea: porcine paratyphoid fever.

2. Identification of epidemic diseases with obvious respiratory symptoms.

(1) normal body temperature, dyspnea, no nasal lesions: porcine asthma.

(2) normal body temperature, dyspnea, nasal lesions: porcine atrophic rhinitis.

(3) elevated body temperature, showing epidemic process, bad: classical swine fever.

(4) elevated body temperature, showing epidemic process, benign: porcine influenza.

(5) elevated body temperature, sporadic or endemic, bad: porcine toxoplasmosis.

(6) elevated body temperature, showing a sporadic or endemic process, benign: swine influenza pseudorabies.

(7) elevated body temperature, sporadic or endemic epidemic, uncertain: porcine lung disease.

3. Identification of epidemic diseases with nerve.

(1) obvious neurological symptoms, nystagmus: porcine infectious encephalomyelitis.

(2) obvious neurological symptoms, vomiting, constipation, hypochondriac pig blood: viral encephalomyelitis.

(3) Neurological symptoms, septicemia: porcine influenza pseudorabies.

(4) neurological symptoms, attacking people and animals: pigs and pseudorabies.

(5) neurological symptoms, septicemia, progressive emaciation: listeria suis.

(6) neurological symptoms, muscle rigidity: porcine tetanus.

(7) neurological symptoms, piglets have head edema after weaning: swine edema disease.

(8) neurological symptoms, septicemia, claudication: porcine encephalitis streptococcosis.

(9) obvious neurological symptoms, a few diseased pigs have neurological symptoms, abortion of pregnant sows and orchitis of breeding boars: porcine brucellosis.

4. Identification of blister disease in foot and mouth.

(1) uniform infection of all kinds of livestock: vesicular stomatitis of pigs.

(2) cloven-hoofed animals can be infected: foot-and-mouth disease.

(3) Piglet infection: porcine blister disease.

5. Identification of piglet blight with diarrhea symptoms.

(1) there are necrotic tissue or fibrin-like substance in feces: piglet paratyphoid.

(2) bloody mucinous dysentery: porcine dysentery.

(3) Yellow-white or dark black watery or paste loose stool: porcine rotavirus disease.

(4) Grey or yellow watery stool, fast transmission, vomiting, high mortality of piglets: porcine transmissible gastroenteritis.

(5) Grey or yellow watery stool, slow transmission and low mortality: porcine epidemic diarrhea.

(6) White paste loose stool: piglet white dysentery (10 ~ 30 days old).

(7) Yellow and white paste loose stool: yellow dysentery of piglets (less than 7 days old).

(8) Blood paste loose stool: piglet blood dysentery (3 days old).

(9) Red dysentery of piglets: segmental hemorrhagic necrosis in jejunum and ileum.

(10) Yellow dysentery of piglets: catarrhal inflammation mainly in the duodenum.

(11) Rotavirus enteritis: there are milk clots in the stomach, diffuse bleeding in the large and small intestinal mucosa, and thin intestines.

(12) transmissible gastroenteritis: the main lesions are in the stomach and small intestine, showing congestion, bleeding, and small undigested milk clots, and the intestinal wall becomes thinner.

(13) epidemic diarrhea: lesions in the small intestine, intestinal wall thinning, intestinal cavity filled with yellow fluid, mesenteric lymph node edema, gastric emptiness.