Common diseases of caged laying hens and their prevention and treatment

Caged laying hens are generally susceptible to fatty liver syndrome, egg drop syndrome and fatigue. The disease and prevention methods are described as follows:

cage layer

Fatty liver syndrome. It is more common in high-yielding layers. On the surface, the laying hens are in good condition, but their egg production rate gradually decreases, or the egg production rate does not reach the peak, or the peak period is shortened. In severe cases, some sick chickens suddenly die. Because fatty liver disease in laying hens is very common, and it is not easy to be detected under normal conditions, it is easy to be ignored by farmers. Autopsy can be found, laying hens liver fat deposition serious, liver and kidney and other organs around the deposition of excessive fat, resulting in laying hens liver bleeding caused by fat metabolism disorder. Control method: 1. Improve feed protein level by 1%~2%, and add a certain amount of bran, add choline 55g, compound vitamin 150mg, methionine 50g per 100kg feed to over-fat chickens;2. Limit feeding before laying, control chicken weight.

Egg drop syndrome. This disease is more common in brown egg-laying hens. When the laying rate dropped to 20%~50%, the quality of eggs also declined, appearing thin shell eggs, soft shell eggs, colorless eggs, waist drum eggs, preserved eggs and so on. Hatching rate of eggs decreased, stillbirth rate increased, even if the chicks out of the shell, vitality is weak, low survival rate. Sick chickens discharge soft feces, green feces; cockscomb blue, neurotic symptoms appear; eat food and do not reduce. Prevention and control methods: 1. Add choline and vitamin B12 in the diet to protect the liver and control infection. Add 0.2% oxytetracycline or 0.2% furazolidone. 2. Increase the protein level of feed to 18%~19%.

Fatigue of caged laying hens. It is mainly due to the lack of calcium, phosphorus and vitamin D in the diet of chickens, or improper proportion of calcium and phosphorus, and long-term lack of exercise, etc., mostly in the early days of postpartum or early laying. Sick chickens often lie on their sides in cages, unable to stand, paralyzed later; slow response, many sick chickens have wing and leg bone fractures, thin and brittle bone wall. Prevention and control methods: 1. Add appropriate amount of vitamin C or vitamin D in the early stage of laying. Available phosphorus in feed was maintained at 0.45%. Vitamin D50 IU was injected intramuscularly into sick chickens to promote calcium absorption. 2. Stick to formula feed. 3. Put the sick laying hens on the ground and let them move freely.