Pig is a warm animal, the temperature is very sensitive to the level of temperature, the ability to regulate body temperature is poor. When the pig house high temperature, high humidity, air flow difference, the swine will feel hot, so feed intake decreased, slow growth, reproductive performance decreased, and once the sow intake of energy and nutrient deficiencies, will lead to piglet development , Malnutrition and decreased immunity.
The temperature required for each stage of the herd is different, which requires the production manager to understand the temperature at all times and to control the temperature in order to minimize the effect of stress due to inappropriate temperature and the impact on the production. The optimum temperature range: boar 17-21 ℃, gestation sow 18-21 ℃, lactating sow 20-22 ℃; nursing piglets 29-33 ℃, conservation piglets 22-25 ℃, fattening pigs 19-22 ℃.
High temperature response measures
① improve the level of diets (especially energy, protein, vitamins). Often provide fresh, adequate, clean drinking water, in time to clean up the water in the tank is not clean.
② strengthen the ventilation, reduce the feeding density. Timely removal of manure, keep the pig clean. Using shading measures to reduce the sun exposure. In the pig house to try to take the wet curtain cooling or often sprinkler, to promote pig heat evaporation, wet curtain cooling system is the most widely used, generally can make the air temperature than the outside low 3 ~ 7 ℃.
③ in the early and late cool when feeding wet spices, and in the feed or drinking water to put anti-stress drugs, such as vitamin C, vitamin E, B vitamins, can effectively improve the pig's anti-stress ability.
Humidity is used to indicate the amount of water in the air the amount of physical quantities, commonly used to represent the relative humidity. The relative humidity of the interior air is affected by the swine, which is closely related to the ambient temperature. Whether the young pig or adult pig, when its ambient temperature is within the better range, the relative humidity within the homes of the pig's production performance has no effect on the pig. Tests show that if the temperature is appropriate, the relative humidity from 45% to 95%, pig weight gain no exception. At this time, often due to other considerations, to limit the relative humidity. For example, taking into account the relative humidity is too low when the pig is easy to float dust, too low relative humidity is also against the pig mucosa and disease resistance; relative humidity is too high will make the pathogen easy to breed, will reduce the pig house structure and Life of the equipment. So even in a better temperature range, the relative humidity within the homes should not be too low or too high.
When the indoor temperature is low, the relative humidity, will make pigs add cold feeling. This is due to the pig's hair, skin adsorption of moist moisture in the air, the thermal conductivity increases, so that the heat of the pig body increased. At the same time, with the ventilation, so that contained in the water vapor in a large number of latent heat lost to homes, reducing the temperature. So the lower the temperature, the relative humidity, will affect the performance of pigs, which is more sensitive to young pigs. For example, according to the experiment in the winter relative humidity pig piglets, the average weight gain than the control group about 48% lower, and easily lead to diarrhea, enteritis and other diseases.
When the indoor temperature is high, the relative humidity within the house, the same will also affect the performance of pigs. Pigs have a strong ability to adapt to changes in humidity, even if the relative humidity of more than 85% of the growth performance is not large, but the high temperature of the high humidity, will hinder the evaporation of pig heat, thereby exacerbating the high temperature hazards. If the temperature exceeds the appropriate temperature, relative humidity increased from 40% to 70%, will slow down the pig's weight gain. This is more sensitive to adult pigs, because the appropriate growth temperature of adult pigs is lower than the piglets.
Suitable humidity in the pig is in the range of 65% to 75%. Humidity is too high affect the pig's metabolism, is caused by piglets yellow dysentery is one of the main reasons, but also induced muscle, joints and other diseases, and lead to dry skin or dry and other issues.
Humidity control measures
1, increase the ventilation: only ventilation can be discharged within the water vapor, ventilation is the best way; but how ventilation, according to the conditions of different pigsty take appropriate measures, the following are several measures to increase ventilation:
(1) Raising the bed: keeping the piglets away from the damp ground, the damp effect will be much smaller;
(2) increase the window area: the inside and outside the ventilation increased;
(3) to install the window: relative to the above windows ventilation, the effect of the window is more obvious, because the wind through the window directly blown to the ground, easier to evaporate water;
(4) the use of fans: the fan can make the air flow to strengthen; this approach in the empty use of the effect is very good, we have to dry homes in the nursery, the use of large fan day and night hair, and soon make care homes dry.