Recently, due to continuous high temperature and high humidity, the egg production of laying hens in many regions has decreased. Many egg farmers have called the newspaper to consult the precautions for laying hens under high temperature. The reporter interviewed Li Xuyun, a veterinarian who oversees the technical supervision of the egg market in Guanghan City. He believes that laying hens should have a good environment in order to maintain normal egg production.
High-temperature and high-temperature means that the ambient temperature exceeds 28°C. The performance of the flock is reduced feed intake, increased drinking water, and decreased faeces; muscle endocrine function weakened, eggshell thinning, protein thinning, soft shell eggs, shelled eggs increased ; mouth breathing, wheezing, severe respiratory alkalosis; shortness of breath, metabolic disorders, severe collapse, dizziness, and soon convulsions died.
To create a good environment for laying hens under conditions of high temperature and high heat, and to keep chickens healthy, the following measures can be taken.
Building houses must be kept in a suitable environment and fresh air, depending on the volume of air in the house, usually combined with temperature difference ventilation and mechanical ventilation. The temperature inside the room is within 24°C. By temperature difference ventilation (natural horizontal ventilation, air inlet and outlet 1:2). When the temperature in the room exceeds 24°C, rely on mechanical ventilation, preferably vertical ventilation. The inlet can be used to spray cold water or Wet curtain device, the lower the inlet temperature, the better.
Strengthen the environment of the chicken house There should be main wind channels around the house, ie open areas, flat areas with open areas or lawns, and the use of cement and bricks as floors. The phenomenon of increased heat concentration and heat concentration will occur. Trees can be planted on the sunny plots at the entrance to the sun or shading facilities, and high-walled and narrow sheds can never be formed. Excessive density is not conducive to the loss of body heat of chickens. The laying density of laying hens in summer should be less than that of spring. Generally, 5 平方米 square meters are suitable for the ground, which can increase the habitat. .
Improve ventilation conditions Ventilation is a condition in which indoor air temperature is high, there is a feeling of air circulation, and there is no dead space. It is important that the chickens have a certain adaptability to changes in the high temperature of the natural environment, and there is a certain adaptation time. This is when preventing the first heat wave attack. A very important job must be done well. The relative humidity of laying hens is 50% to 55%. If the relative humidity is more than 72%, the coops are hot and the feathers become contaminated, which may cause diseases. If the relative humidity is less than 45%, the dust in the house flies, and the chickens are prone to respiratory diseases. disease. Lime, ash, etc. can be placed on rainy days. When the humidity is low, sprinkle water properly.
Improve management In the high-temperature and high-heat season, controlling the Sherwin is the basis of all management, and the core is to relieve or alleviate the high-temperature and high-heat stress response. It is necessary to determine the group feeding and management. Pay attention to the flock and if there is any abnormality, take timely measures. To increase the number of feedings and feeds in the morning and evening, you can also use cold water to mix and increase the light time. Feeding and drinking are not allowed during the high temperature period, reducing the amount of chicken exercise and keeping the birds in a quiet state.
Improved nutrition Because most chickens have reduced feed intake and high egg production rates due to high temperature and high heat, it is important to improve nutrition and maintain the body heat balance. Increase the ratio of protein to energy, energy per ton of feed plus fat 10 to 20 kilograms, protein to increase plant protein, increased methionine content (58%). At the same time adjust the electrolyte balance, supplement vitamin C, and increase the amount of sodium bicarbonate and sodium chloride and vitamin E (150 mg/ton).
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