The reason why silkworms do not cocoon
1. Pathological factors. For example, purulence and malacia are easy to be infected before the upper cluster, which destroys the secretory function of the silk gland of the silkworm, or the pathogen produces a large number of toxic metabolites in the silkworm, which paralyzes the nerves of the silkworm and cannot spin cocoons.
2. Physiological factors. The first is the abnormality of the central silk gland, mainly because the feeding temperature is too high or too low, the leaf quality is too tender, the secretory gland is maladjusted, and the silk gland is abnormal, and the second is the abnormality of the anterior silk gland. it is mainly caused by excessive exposure to bad gases such as gas, fishy gas and alcohol in the process of feeding.
3. Trace pesticide poisoning. During the period of feeding or clustering, ingestion or contact with trace pesticides caused the imbalance of endocrine glands in the silkworm body, but could not spin silk.
4. Improper operation of the upper cluster. The extensive operation of the upper cluster leads to the rupture of the silk gland, or the temperature in the cluster is too low, the cluster is not clean, the upper cluster is too dense, the upper cluster environment is poor, and other reasons make the silkworm stop spinning for a long time without cocooning.
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Simple prevention and treatment of common diseases of pigeon
Pigeon plague: is caused by pigeon type I myxovirus, the mortality of the disease is high, showing neurological symptoms, shaking the head, often diarrhea. Medication is ineffective. Autopsy: there were bleeding spots in glandular stomach, intestinal mucosa bleeding and encephalitis. Prevention: ① uses peracetic acid 0.3% with pigeon spray disinfection, 0.5% concentration peracetic acid shed, environmental disinfection. Iodine type disinfectant can also be used. ② with pigeon type I Fu myxovirus inactivated vaccine prophylactic injection, chest muscle injection, injection should be slow rather than fast, each injection 0.5ml, generally in squab 30
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Snake pattern
Alias: red snake, spot snake, leopard snake, colorful swallow, discus, colorful fish, colorful fairy species: Sparidae water temperature: 20-28 ℃ hardness: less than 5dhPH value: 4.2-6.8 by the offspring of brown pine stone, occasionally there will be one or two pine stone with finer stripes, and then by Thailand and Penang
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