Laying hens should have a good environment during the laying period in order to maintain normal egg production. In recent years, with the increase of global temperatures, the relatively cool regions of the north are affected by high temperature and high heat. Therefore, the feeding and management of laying hens in high-temperature and high-heat seasons is a new topic and should be paid attention by the chicken industry. High-temperature and high-heat means that the ambient temperature exceeds 28°C. The performance of the flock is as follows: 1. Feed intake decreases, drinking water increases, and faeces become thin. 2, the body's endocrine function weakened, eggshell thinning, protein thinning, soft shell eggs, shell eggs increased. 3, mouth breathing, wheezing, severe respiratory alkalosis. 4, shortness of breath, metabolic disorders, severe collapse, dizziness, and soon convulsions died. To create a good environment for laying hens at high temperature and high fever, and to maintain the health of the flock, the following measures can be taken: 1. The construction of sheds must maintain a suitable home environment and fresh air, depending on the air circulation in the house. Combination of temperature ventilation and mechanical ventilation. The temperature inside the room is within 24°C depending on temperature difference ventilation (natural horizontal ventilation, air inlet and outlet 1:2). When the temperature in the room exceeds 24°C, mechanical ventilation is preferred, and vertical ventilation is preferred. The air inlet may be filled with cold water or Wet curtain device, the lower the inlet temperature, the better. Drum cold air can also be used. 2, to strengthen the environment of the hen house construction There should be a main wind way in the coop around the open land, open areas require flat or equipped with lawns, prohibiting the use of cement and brick paving, so there will be increased heat concentration of micro-heat. Trees can be planted on the sunny side of the air inlet or shading equipment, never forming a high wind wall and narrow sheds calm wind field area. 3, to improve the ventilation conditions Ventilation is indoor temperature conditions, the table air circulation feeling, there is no dead, it is important to make chickens have a certain adaptability to changes in the natural high temperature, there is a certain adaptation time, so that in the first heat wave attack prevention is A very important job must be done well. 4. Improve Management In the high temperature and high heat season, the control of 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. To avoid noise interference, feeding, water feeding, sanitation, and picking eggs should be light to prevent frying. After vertigo occurs, soak the chickens with cold water and transfer them to the cool shade. At the same time, each chicken is fed with 1 drop or 2 drops of 10 drops of water, or 4 tablets of dan-5 capsules. 5, to improve the nutritional conditions because of the high temperature and high fever, most chickens have reduced feed intake, egg production rate decreased, so to improve the nutritional conditions and maintain the body heat balance is very important. To increase the protein energy ratio, generally ME10%, crude protein 25%, can achieve the effect of conventional feeding. Energy per ton of feed plus fat 10 kg -20 kg, protein plus plant protein, increased methionine content (58%). At the same time adjust the electrolyte balance, supplement vitamin c, increase sodium bicarbonate and sodium chloride vitamin e (150 mg / ton) of the amount. In addition, to increase anti-stress drugs, adding 40 mg of bacitracine zinc per ton of feed can reduce calories, and can also add virginiamycin 10 ppm-15 ppm to increase feed conversion rate and survival rate of chickens.
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