One, chicken louse pathogen, chicken louse usually parasitizes only on chicken body, it is a kind of forever. For persistent parasites, the whole life cycle of the parasite occurs in the body of the chicken, which can live for several months, but can die 5-7 days after leaving the host. Chicken Louse is a common disease in chickens, and it is also a kind of common ectoparasite. There are many kinds of chicken lice, such as chicken feather louse, chicken body Louse, Big Lady Louse and so on. The structure of different species of chicken lice is generally the same. The insect body size is about sesame, 6 legs, divided into head, chest, abdomen three parts, head wider than the chest, chewing mouthparts, chest three sections, each section of the abdomen has a pair of legs. 2. The epidemic of chicken lice can occur all year round, but in the hot summer and autumn is the high incidence of chicken lice, which is mainly due to the hot weather, high temperature and high humidity environment, suitable for the breeding of chicken lice. In addition, the incidence of chicken lice is higher in winter because the feathers of chickens are dense and suitable for the growth of chicken lice. When the temperature is 25 °C, every six days, chicken lice can reproduce a generation, reproduction speed. The incidence of the disease is high in the chicken farms where the chickens have been raised for many years. The main mode of transmission is through direct contact between hosts, but also through indirect transmission of public tools. The main route of transmission of the disease is crowding of chickens due to high feeding density. In general, poor breeding management and relatively poor breeding environment, such as poor sanitary conditions, indoor temperature is not suitable, feeding density is too large, poor ventilation, indoor humidity is too high incidence of disease is the main reason.

Third, the symptoms of chicken lice, chickens will show obvious clinical symptoms after the disease. Because the chicken louse can gnaw the feathers and the Dander of its host, thus causes the chicken skin to be stimulated by the louse to Itch, is more uneasy, displays for the common bill pecks to Itch, causes the feather and the skin to be injured, when serious can cause the feather to fall off, the skin to have the injury, suffering from dermatitis or bleeding from the skin. Sick chickens often show signs of listlessness, poor appetite, lack of good rest due to itching of the skin, which causes anemia and gradually wasting away. When the disease is serious, the chicks will die, and the growth and development of chickens at the stage of growth and development will be hindered, even stop development, broiler production performance decline, because of feather tribes, skin damage and affect the quality of commodities, layers of egg production decline. Although the mortality rate of the disease is low, it will lead to the disease of chicken resistance to decline, and easy to secondary infection of other diseases and increased mortality. 4, Chicken Lice Harm, chicken infestation by the chicken lice, there will be feather off the phenomenon, some infected chicken skin bleeding spots or nodules, if too many chicken lice will induce purulent dermatitis. A chicken louse bites the skin of a chicken and secretes venom to stimulate the skin when it sucks blood, causing the chicken to Itch, causing it to become agitated, affecting feed intake and normal rest, and degrading its constitution and resistance, then the growth and development of chicken was affected, gradually wasting, anemia, the damage to the growing chicken is obvious. The laying rate of laying hens decreased significantly, which seriously affected the economic benefit of chicken industry. The results showed that the egg production of 1000 layers decreased from 95% to 88% of normal egg production, from 88% to 75% of normal egg production under moderate condition, and less than half of normal egg production under severe condition. In addition, Chicken Lice Act as media for some viral disease and bacterial diseases, spreading the disease, and they can attach to people and affect the work of breeders. Although the harm of chicken lice is not as serious as other infectious diseases, the control of chicken lice should be emphasized. A small number of ticks can easily be ignored, leading to the proliferation of ticks, making treatment difficult.