In the winter in the northern parts of the country, the temperature in the pig house is difficult to control, especially in pigs with open and semi-open structures. In order to effectively control the microclimate of the pig house and fully tap the productive potential of the pigs, pig farmers mostly construct plastic film greenhouses in winter. Although raising pigs in greenhouses can significantly increase the growth rate of pigs, effectively reduce production costs, and improve breeding efficiency, it must be based on careful operation and management, including the following aspects.

The temperature required to control the indoor temperature of pigs in different ages is not consistent. For growing pigs, the suitable temperature is about 20°C. The shed is earlier or the shed is later, especially at sunny noon. The internal temperature is relatively high. If the temperature in the shed exceeds 25°C, the window can be opened or the shed can be dissipated, or some grass curtains can be put down to block the radiant heat. In the absence of sunlight at night, cloudy days, rain and snow days, in order to reduce the loss of heat, grass curtains should be put down in time to keep warm. During the cold season, roots can be excavated in the piggery to protect the cold, fill the weeds inside, and prevent the heat from being distributed outside.

The importance of airtight and air-diffusing film sheds is good, air is not easy to circulate, and harmful gases such as ammonia, hydrogen sulfide, carbon dioxide, methane, and fecal odor are most likely to accumulate in the shed, causing direct damage to the pigs and causing more damage to the pigs. In case of a disease, harmful gases must be expelled in a timely manner. Shelter ventilation is usually conducted at high temperatures in the noon house, 2 times a day, 20 minutes for big pigs and 10 minutes for piglets. Ventilation of air can only reveal the film on the south, avoiding draughts. The surface area of ​​the film is to be referenced to the temperature and harmful gas concentration in the house. When the temperature is high and the concentration of harmful gases is high, some of them can be revealed. The weather between rain and snow can be reduced. Insufficient light in cold weather can use coal stoves to assist warming, but smoke must be removed in time. The overall judgment criterion is that people breathe smoothly in the pig house, do not feel chest tightness, glare, pungency, and there is no strong odor.

Attention should be paid to the adjustment of humidity in greenhouses. Pigs can be raised in one square meter per square metre, piglets can be kept in three to four heads per square meter, and when large groups are raised, 20 to 30 heads per group are appropriate. Density is too high and the population is too large. Large is not conducive to controlling humidity and harmful gas concentrations. Shedding time is generally appropriate from November to March of the following year, and can also be flexibly controlled according to climate change. The relative humidity in the greenhouse can be controlled at 60% to 75%. To do this, the feces should be cleaned daily and the feces should be transported outside the house. The urine should not be allowed to accumulate in the interior, and the water tank should be cleaned in a timely manner. When it is too dry, the humidity can be adjusted in conjunction with spray disinfection.

Do a good job in the maintenance of warm greenhouses to build greenhouses commonly used polyethylene film, polyvinyl chloride film, drip-free film. Polyethylene film has high light transmittance, but poor insulation, and is easy to age; PVC film easily absorbs dust, affects transparency, easily softens at high temperatures, hardens at low temperatures, and chlorine is harmful to pigs; the advantage of non-drip film is that the surface is not easy Vapor fog is formed and the water vapor quickly condenses to form droplets and then flows downward. No matter what kind of film you choose, you should always pay attention to doing a good job of maintenance. After snow, you must clean the snow on the top of the shed. After the wind is strong, clean the dust, sand, and grass clippings on the film. You can also rinse with clean water at noon on sunny days. film. If the film is partially damaged, it should be promptly repaired, adhesive can be used, or heated using soldering iron after welding, if the damaged area is small, you can use ordinary sewing needle sewing.

Observe that although the use of a warm shed in a pig herd can better control the environmental conditions in the pig house, it is still necessary to strengthen the daily observation of the herd and if any abnormality occurs, measures should be taken to adjust it in time. Observing the herd should pay attention to the following aspects: looking at the appetite, drinking desire, strong appetite, drinking habits of pigs, indicating that the environment is more coordinated in vivo and in vitro; see the mental state, lively pig performance, responsive, indicating that the environmental conditions are controlled Appropriate; see the fecal form, through the color, shape and hardness of excreta to determine the health status of the pigs, indirectly inferred the appropriateness of environmental conditions; look at the coat morphology, the coat is smooth, shiny, indicating that the temperature and humidity are compared Appropriate; look at the color of the mucous membranes, the mucous membranes appear normal colors, indicating that the concentration of harmful gases will not be very high.

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