The suitable temperature for laying hens is 15°C-17°C. Summer temperatures above 30°C will affect the feed intake and egg production of laying hens. When the outside temperature continues to rise and the chicken house temperature reaches 39°C or above, chickens have difficulty in breathing, feed intake, apathy, and reduced activities, which can lead to death. If the high temperature persists, the laying hens will suffer from heat stroke, the highest mortality rate will reach 30%, and the egg production rate will drop to 50%, which will bring huge economic losses to farmers. How to ensure that the laying hens will have a smooth summer and maintain a stable egg production rate, and the following measures should be taken in production:
1. Do a good job of greening. In order to reduce the temperature of the surrounding environment of the chicken house, the whole greening shall be implemented, and corresponding plants shall be selectively planted around the working channel and the chicken house. On the one hand, the plant leaf surface moisture evaporates and heats down. On the other hand, climbing plants on the wall and roof of the house can also block direct sunlight and reduce the calorie intake in the house.
2. Installation of facilities. The shade net or other shading facilities can be erected at the appropriate positions on the sun surface and the top of the hen house, doors and windows, etc. to effectively block direct sunlight, so as to achieve the purpose of cooling and preventing sunstroke.
3. Insulation cooling. In order to reduce the heat in the environment and enter the chicken house, on the one hand, the thickness of the wall and the top should be appropriately increased to make the heat insulation better; on the other hand, the surface of the wall and the top should be painted with a strong reflective ability. Light color.
4. Evaporative cooling. Because the evaporation of water can take away a lot of heat and reduce the temperature in the environment, in order to reduce the temperature in the laying hen house in summer, ventilation should be done to speed up the evaporation of water; on the other hand, the ambient temperature should be higher. During the time, spray proper amount of moisture in the house and outside environment or activate the curtain at the door and window to promote water evaporation.
5. Ventilation and heatstroke prevention. The suitable humidity in the laying sheds is 60% to 65%. When the humidity is too high, it is not only unfavorable for cooling, but also causes heat in the hen due to the uncomfortable feeling of laying hens. Therefore, ventilation should be done in the summer through the use of favorable chicken house locations, architectural design, and facilities and equipment.
6. Reduce the density. As with other animals, laying hens continue to discharge physiological heat into their living environment through radiation and respiratory convection, which increases the amount of heat and temperature in the environment. Therefore, it is an effective measure to reduce the temperature and prevent heatstroke by properly reducing the breeding density of laying hens during the summer.
7. Guarantee nutrition. Because laying hens are more prone to heat stroke in under-nutrition conditions, the feed intake of laying hens decreases as the ambient temperature rises; in order to make them eat enough nutrients and improve their ability to resist heat stroke, the summer should The protein content in the feed of laying hens is appropriately increased, and on the other hand, it can be fed in the morning, evening and night when the ambient temperature is low.
8. Adequate drinking water. Moisture is an essential material for production and physiology of laying hens. At the same time, summer moisture is an important carrier for the cooling of laying hens through respiration. Therefore, in order to prevent heat from laying hens in summer, sufficient clean drinking water should be provided.
9. Drug heatstroke prevention. Adding 0.3% to 0.4% sodium bicarbonate, 300 mg/kg vitamin C, and moderate amounts of Chinese herbal medicine to regulate the digestive system in laying hens' feed in summer can effectively reduce the incidence of sunstroke in laying hens because these substances have enhanced Appetite, accelerate heat dissipation, improve stress resistance, reduce stress.
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