Environmental characteristics of plastic greenhouses In winter ducks in common duck houses, the main source of the house temperature is the biological heat emitted by the duck body. The outside temperature is low, the duck house insulation performance is poor, duck body heat is more, this will not only increase the duck's feed intake, in serious cases will cause the death of the duck. With the large investment in common duck houses, the cost of raising the livestock is increasing, and the risk is also greater. Ducks in plastic sheds can keep the biological heat emitted by ducks well. They can also use solar energy to convert light energy into heat energy to raise the room temperature. There are certain advantages in winter use. At the same time, the investment province can also use injections. Ultraviolet sterilization in the sunlight can enhance the duck's immunity and disease resistance, promote the development of the duck's bones, stimulate the appetite, promote digestion, and also promote the development of the body temperature regulation function of the ducklings. Yu. However, due to the poor ventilation of plastic sheds, the indoor temperature and harmful gas content will often be too high during the rearing. Therefore, when using plastic sheds, they must be rationally designed to take into account the necessary ventilation and auxiliary adjustment facilities to maintain the shed's environment. The best microclimate state in duck growth. Plastic greenhouse design and technical requirements Plastic sheds should be built in high-dry and sunny places. They should avoid tall buildings and trees as much as possible. There should be tap water or clean water sources nearby, and there should be power lines. The transportation must be convenient without interference, and the leewards should be sunny. No wind, the scaffolding is best for things to go. The structural requirements for plastic greenhouses are as follows. The slope of the shed roof When the angle between the sunlight and the plastic film is 90, the light transmittance is the highest. According to the specific situation of the incident angle of sunlight at noon of winter solstice in China at 2133′-2633′, the angle between the plastic film and the ground should be 6327′-6827′. In such a slope, all roofs are covered with plastic film, and duck canning rooms are fully achievable. The height of the shed The design height of plastic greenhouses should generally be about 2.5m. This will not only benefit the operation of the breeders, but also facilitate the ventilation of the houses. The orientation of the booth When designing a greenhouse, the general axis is the east-west axis, and it travels from north to south, which is conducive to the direct sunlight to the inside of the house and is conducive to the full use of solar energy. Plastic film material It is more appropriate to use polyvinyl chloride membranes in duck plastic booths. The thickness of plastic membranes should be 0.08-0.12 mm. Ventilation ventilation port settings The exhaust outlet of the booth shall be set on the leeward side of the greenhouse, and shall be provided with a windproof cap at the discharge port 50 cm above the ceiling. This will not only prevent the cold wind from filling people, but also help the smooth ventilation and ventilation. The air intakes of the sheds should be located on both sides of the gables. The size of the exhaust outlet should be determined according to the number of ducks raised. For example, a greenhouse with flat ground raising ducks (eg, 20m long, 5m wide, and a greenhouse with 1000 rearing ducks) can be provided with a leeward surface area of ​​25cm25cm. There are five air outlets and five air outlets at the top of the room. Technical performance and environmental regulation of plastic greenhouses Plastic sheds are a close-to-enclosed specific environment. Each factor of its environmental conditions has its own special variation. Whether or not the meat ducks in the sheds can be successfully managed depends on the influence of various environmental factors on the meat ducks on the one hand, and on the adaptability of the ducks and the ability to manually adjust the environment of the shed. Understanding the requirements and adaptability of meat ducks to the environmental conditions in the greenhouses, familiarizing themselves with and mastering the general changes in environmental factors before and after feeding meat ducks in plastic greenhouses and human regulation methods are the basis for ducks in plastic greenhouses. Greenhouse insulation and temperature regulation The heat of the plastic greenhouse is derived from the radiation of the sun on the one hand and the biological heat from the duck body on the other. According to the actual production, the temperature in the greenhouse after the duck is 5-13°C higher than the temperature outside the greenhouse, but the plastic greenhouse Without taking insulation measures, the temperature difference between day and night in the room is 10-15°C. This large temperature difference between day and night is harmful to meat ducks. Therefore, it is necessary to properly set the heat preservation device to increase the indoor temperature and reduce the temperature difference between day and night. In a sense, the quality of temperature management will directly affect the success or failure of duck breeding. Therefore, a reasonable plastic greenhouse structure must be properly selected, and certain insulation measures must be taken. The size of the vent must be adjusted, and the cover and roll must be adjusted. Insulation curtains to adjust the room temperature, to the shed greenhouse equipped with "quilt" and straw. At night, cover the surface of the plastic film with “covers†of paper; when outdoor temperatures are low, cover the grass with “covered†paper, and close the ventilation window on the back if necessary. When the outdoor temperature rises during the day, the straw and paper must be “rolled†and fixed at the top of the greenhouse. From 12:00 pm to 14:00 pm, ventilation windows can be opened for cooling. Humidity Characteristics and Dehumidification of Plastic Greenhouses High air humidity is the main feature of ducks in plastic greenhouses. The greenhouse has a small space and poor air permeability. When the ventilation is not paid attention, the air flow will be relatively stable. When the temperature is high during the daytime, the amount of evaporation is large, the environment of the greenhouse is relatively closed, and it is not easy to convection with the outside air, so the phenomenon of high indoor humidity often occurs. At night, on cloudy days, especially when the temperature is low, the relative humidity of the air is even saturated. This high humidity condition is harmful to the feeding of ducks. Humidity in greenhouses is mainly due to the evaporation of faeces and respiratory vapors discharged from ducks. In particular, during daytime feeding and exercise, the metabolic rate is high, the respiratory rate is high, and the excretion of feces is more concentrated in the daytime, thus daytime duck sheds. The humidity will be higher than at night. To reduce the humidity in the shed, in addition to paying attention to the terrain when selecting the site, we must also pay attention to timely ventilation. Ventilation is best selected during the day because daytime indoor ducks have a high metabolic rate, defecation and humidity, and high temperatures during the day and a large amount of heat from the ducks. At this time, ventilation does not cause a sudden drop in temperature. In addition, the excrement discharged from ducks should also be promptly removed during feeding, and the bedding should be replaced promptly when the shed is raised. As long as it is properly adjusted, the humidity can be controlled. Air Condition and Excluding Harmful Gas in Plastic Sheds Plastic greenhouses often have a closed state. If the ventilation and ventilation are not enhanced, the concentration of gas such as H2S, NH3, and CO2 in the shed will be much greater than that in the air, which will affect the normal growth of the duck. It is an important task in the management of ducks in plastic greenhouses to effectively control the time and frequency of ventilation. Without affecting the indoor insulation, the design should be designed for maximum ventilation. When used, a reasonable amount of ventilation can be selected according to the requirements. The amount of ventilation is mainly determined by the degree of adaptability of the duck, more appropriate during the day, more ducks than ducklings. Transparency and light management of plastic greenhouses The superiority of feeding plastic ducks in plastic greenhouses is particularly evident in winter, when the weather is good and the sun shines. However, at this time, the intensity of sunlight is too high due to direct exposure to the shed. Especially at sunny noon, the irradiation intensity is higher. Increased, although it is conducive to increase the room temperature, but also due to high illumination caused by the emergence of ducks. Therefore, when the sheds in the greenhouse have high illuminance, they must be shaded. When using shading measures, in order to increase the room temperature by allowing sunlight to pass through the room in the winter, shades of grass can be shaded from the plastic film by a few tens of centimeters in the shed; shading is not allowed outdoors in winter so as not to affect the temperature in the shed, but in the summer When using greenhouses to duck, in order to prevent the greenhouse temperature is too high, it must be shaded outdoors. At the same time, due to the short duration of sunshine in the winter, especially in cloudy days, the only natural light can not meet the needs of meat ducks for feeding time and nighttime heating, and it is even inconvenient for keepers to observe. Therefore, it is necessary to supplement the light time in the greenhouse. Xos Syrup,Xylo-Oligosaccharides Food,Xos Prebiotic Qingdao Bailong Huichuang Bio-tech Co., Ltd. , https://www.qdblcycn.com