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Which Drugs Are Contraindicated In Laying Hens

Which drugs are contraindicated in laying hens

1. Furans: Furans are synthetic broad-spectrum antibacterial drugs. Furazolidone is commonly used, which has specific effects on diarrhea caused by Salmonella, so it is also called furazolidone. Clinically, it is mainly used for intestinal infections, such as pullorum, coccidiosis, and typhoid fever. However, the drug also has the side effect of inhibiting egg production, so laying hens should not be used.

2. Purines: Purines have a smooth muscle relaxation effect, can relieve bronchial smooth muscle spasm and produce anti-asthmatic effects, and are used to relieve breathing difficulties caused by respiratory infections in chickens. Laying hens have decreased egg production after use, and can still recover after drug withdrawal.

3. Testosterone propionate: Testosterone propionate is a male hormone that is mainly used for waking broody chickens. It should be stopped immediately after waking. Long-term repeated use will inhibit hens ovulation, and even male mutations will affect egg production.

4. Chlortetracycline: Chlortetracycline is a broad-spectrum antibiotic of the tetracycline class, which has good effects on pullorum, typhoid fever and cholera. Its side effects not only stimulate the digestive tract and damage the liver, but also combine with calcium in the blood to form insoluble calcium salts that are excreted from the body, preventing the synthesis of eggshells and reducing the egg production rate of chickens. Therefore, the use of laying hens must be prohibited.

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