Swine scabies should be prevented in winter

Pig scabies mite is also known as scabies, commonly known as scabies, is parasitic by scabies mites in pig skin, causing skin red spots, pustules, scabs, cracks and other lesions. Characterized by severe itching, restlessness, loss of appetite, slow growth and reduced feed returns are one of the diseases that seriously endanger production. It is common in some farms, it is difficult to cure, the severity of clinical symptoms is related to the resistance of pigs, suitable climatic conditions, when the feeding and management is good, the resistance of pigs is strong, generally no obvious symptoms. In summer high temperature season, often washing pig pens and pig body is helpful to reduce the symptoms of scabies; cold weather, pig physical consumption, poor feeding and management, pig resistance decreased, clinical symptoms aggravated.

Life history and epidemic characteristics of scabies mites

The whole development process of scabies mites is spent on animals, including egg, larva, nymph and adult, in which male mites are one nymph stage and female mites are two nymph stages, and the whole development process of scabies mites is 8 ~ 22 days, with an average of 15 days. The life span of scabies mites in vitro varied significantly with temperature, humidity and sunlight intensity, and died after 2 to 3 days at 18 ℃ ~ 20 ℃ and 65% air humidity, and 15 ~ 18 days at 7 ℃ ~ 8 ℃.

Cause of disease

Scabies mainly occurs in winter and late autumn and early spring. Because of insufficient sunlight in these seasons, livestock hair is long and dense, especially under the conditions of moist enclosure, poor animal hygiene and high skin surface humidity, it is most suitable for the development and reproduction of mites. From the end of autumn to the beginning of spring every year, plastic sheeting is often used in northern China to raise pigs. This method has poor ventilation and insufficient light, which leads to another major disease besides respiratory diseases in pig production in winter-pig scabies.

Clinical symptoms

Pigs are only parasitic with scabies mites, and pigs are frequent. The disease begins in the eyes, cheeks and ear roots, and then spreads to the back and the inside of the hind limbs. Diseased pigs often rub the diseased parts in the walls, pens and grooves, causing bleeding, connective tissue hyperplasia and skin thickening. Local hair removal. As a result of itching, affect the normal feeding and rest of sick pigs, and reduce the function of digestion and absorption; in the cold season, due to depilation and exposed skin, a large amount of body temperature is distributed, and a large amount of accumulated fat in the body is consumed, resulting in weight loss, sometimes when secondary infection is serious, causing death.

In short, severe itching, hair removal, scab, skin wrinkles or cracks, and highly contagious for the characteristics of the disease.

Diagnosis.

Scabies mites with obvious symptoms should be diagnosed according to the season of onset, severe itching and skin lesions of the affected area. when the symptoms are not obvious, it is necessary to take the scab at the junction between health and patients to check for the presence of worms for diagnosis.

Clinical attention should be distinguished from eczema, allergic dermatitis and parasitism of lice and hair lice.

Prevention and cure

The feeding and management of ① should be improved from the aspects of hygiene, light, ventilation, drying, density, disinfection and strengthening nutrition.

② can use commercial coccidia vaccine and some nematode vaccines to immunize severely infected pigs (farms), and cooperate with regular deworming work (especially in winter). Every 2 months to 3 months, Livestock Dazhuang tablets are mixed with 35 kg body weight for prevention.

③ should isolate diseased animals in time and use chemical drugs to treat them. Ivermectin injection should be injected subcutaneously at 0.2mg ~ 0.3mg / kg body weight and repeated after 10 ~ 14 days. Or take Dazhuang tablets every two tablets of 35kg body weight and repeat them after an interval of 7 to 10 days (because most anti-mite drugs can only kill insects but not eggs at that time, they must be treated 2 ~ 3 times with an interval of 7 ~ 10 days to kill newly hatched larvae).