In August 2005, several laying hens raised in chicken farms in our county developed diseases characterized by anaemia, pale cocks, decreased egg production rate, sputum, and sporadic death, according to clinical characteristics, necropsy changes, and laboratories. Diagnosis, etc., was diagnosed as Karlelloichnosis. The author took effective preventive measures after diagnosis to control the epidemic.
1 Incidence and symptoms
In the early stage, the cockscomb and flesh color become lighter, and then the diseased chicken is depressed, the appetite is diminished or eliminated, the pheasant, cockscomb and flesh are pale, the yellowish green or white dilute feces, and the root of the cockscomb is pale and the upper part is white or yellow. Some chickens have red granules on their crowns. Some chickens have necks, chest and abdomen, and subcutaneous linings on the inside of the hens have bleeding spots of varying sizes. The egg production rate has dropped sharply. Soft shell eggs and thin preserved eggs have been produced, followed by sporadic deaths and daily death rates. Between 0.2% and 0.5%, most of the affected chickens had convulsions and convulsions before their death. Some chickens died of oral and nasal bleeding before and after death.
2 necropsy changes
Twenty-two morbidly dying chickens were diagnosed with subcutaneous nodules (12/22) subcutaneously under the neck and chest and abdomen; crowns, face, flesh were pale, blood was thin, and muscles were pale (22/22); liver was swollen and yellowish There are many miliary hemorrhage nodules or yellow-white nodules (20/22); the spleen is swollen, with needle-point hemorrhages and gray-white nodules (20/22); the pancreas has many miliary-sized hemorrhages Nodules with distinct boundaries (16/22); peritoneum, mesentery with well-defined bleeding nodules (18/22); small intestine dark red (13/22); intraperitoneal clot or yellow-red ascites (9/ 22); Hemorrhage of the kidney with clot on the surface (8/22).
3 laboratory diagnosis
Using a needle that has been sterilized, a drop of blood is drawn from the dying chicken cocks, stained with Giemsa's stain, and observed under a microscope at a high magnification.
4 treatment
4.1 Compound Taichenjing 500mg/kg spices, feed 3 days, switch to 200mg/kg spices for 7 days, effective, and add 0.1% baking soda in drinking water to reduce the toxicity of sulfonamides side effect.
4.2 Baiguanjing Granules (mainly composed of Changshan, Artemisia annua, Divine Comedy, Phellodendron, Daban, etc.) drink water at 150g per bag 50g, once every 4 to 5 days, 2 days after drug withdrawal, and 5 days after treatment, the effect is also very good, and the cost is more compound. Thai extinction net low.
At the same time as medication, vitamin K3 is added to drinking water or feed to alleviate the bleeding symptoms of chickens. Electrolysis multidimensional or quick supplement is added to drinking water to promote the recovery of diseased chickens. Generally, the death can be controlled within 2 days after drug administration. In 20 days, the egg production rate began to recover.
5 Preventive measures
5.1 Do a good job in environmental sanitation. Eliminating weeds around chicken coops, flattening foul sewers to reduce mosquito breeding.
5.2 Elimination of intermediate hosts. Kudzu is the medium for the disease. In order to cut off the route of transmission, during the popular season, insecticides that are less toxic to chickens, such as hydrogen-permethrin and extermination agents, are sprayed inside and outside the house to eliminate galleries.
5.3 Drug Prevention. During the epidemic season, preventive medicines such as compound chlorbenzuron are added to feed or drinking water to prevent the occurrence of the disease.
6 Summary
6.1 The typical Kjell's live leukodesis in laying hens is the first time in our county. In July and August 2005, the climate in our county was hot and humid, and the temperature was always above 20°C, which was conducive to the large-scale breeding of quails. The disease is endemic.
6.2 When the compound is used to prevent and treat the disease, the dosage should be sufficient and the duration of treatment should be sufficient.
6.3 Prevention and treatment of laying hens' Caen's disease should use Chinese medicinal preparations as much as possible to avoid affecting egg production and causing drug residues.
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