Environmental factors: light program or change of light intensity: such as changing light color at any time, stopping illumination suddenly, shortening illumination time, weakening illumination intensity, irregular illumination time, time, time, time, time, time, time, time, time, and so on. Severe shortage of ventilation, long time no ventilation, etc. Attacks of Natural Bad Weather: Suddenly attacked by heat waves, typhoons or cold currents without preparation or prevention in advance. Long-term water cut-off: due to water supply system failure or forgotten to open the switch, resulting in long-term water shortage or water cut-off.
Feed factors: significant changes in feed composition or quality in the diet can cause changes in laying eggs. For example, the sudden change of raw materials in the diet, uneven mixing of feed, mildew and deterioration of feed, replacement of fish meal and yeast meal, high salt content, high stone powder addition, replacement of cooked bean cake into raw bean cake, forgetting to add salt in feed, etc., reduced the feed intake of chickens and caused indigestion. The laying rate is normal and the weight of the chickens does not decrease, which indicates that the feeding quantity and the nutritional standards are in line with the physiological needs of the chickens, and there is no need to change the feed formula.
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Chicken flock disease: Acute and chronic infectious diseases can cause a sudden drop in egg production. If chickens are attacked by virulent Newcastle disease, egg production will often be reduced by more than 50%. Egg laying rate will be reduced by 20%-40% if infected with Egg Reduction Syndrome. If mixed infection with other diseases, egg laying rate will be reduced by more than 20%. In addition, chickens infected with infectious bronchitis, infectious laryngotracheitis, cholera, coccidiosis, colibacillosis, avian influenza and so on, will greatly reduce the laying rate.