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According to experiments, the highest swine growth rate and the highest utilization rate of the shepherd's temperature were 20°C and 24°C, respectively. Pigs are warm-blooded animals, the body temperature has been maintained at 38.7 °C ~ 39.8 °C, the impact of changes in outside temperature is very small. The adaptability of pigs to temperature increases with the increase of age, and the lower critical temperature can decrease with the increase of age. If the temperature of the pig house is lower than the lower critical temperature, it will affect the weight gain, increase feed consumption, and even freeze death and death. . Therefore, the pig raiser must understand the critical temperature during the growth of the pig so as to take appropriate measures for the insulation of the pigs in different growth stages. (I) Physiological characteristics of pigs at each stage 1. Critical temperature of pigs Newborn piglets 32°C～35°C, 4～10kg piglets 29°C～24°C, bred breeding pigs (finishing pigs) after 3 to 4 weeks of weaning 25°C ~ 15 °C, the lower critical temperature of adult pigs 12 °C. However, the lower critical temperature is not absolute. In general, lean pigs are higher than fat pigs; lean pigs are higher than fat pigs, and they are also affected by various factors. 2. Weaning pigs aged 27 to 30 days old, after 1 week of weaning, the average feed intake was lower than the requirement for maintaining metabolic energy, showing a negative energy level, and the weaned pigs maintained the main body temperature of the backrest fat, therefore, the critical temperature increase was required. To 26 °C ~ 28 °C, compared to 4 ~ 5 weeks of age piglets increased 5 °C ~ 3 °C. After 2 weeks, the lower critical temperature can be reduced to 24°C. Once the weaned piglet has resumed normal feeding without diarrhea, the weekly lower critical temperature can drop by 2°C to 3°C until it reaches the critical temperature of normal growing pigs of 25°C-15°C. 3. According to the physiological phenomenon of the pig's metabolic rate at night, which is lower than that during the day, the nighttime calorie consumption is smaller than that during the day. At night, the homeopathic temperature is lower than the lower critical temperature, 4°C to 9°C, without affecting the growth. In order to save fuel, no heating is required. However, if the sherve temperature fluctuates from 3°C to 4°C, diarrhea is more likely to occur in weaned piglets. In order to allow normal growth, thermal insulation must be strengthened. 4. Wind speed has an important influence on the rate of heat loss and growth of pigs. Young pigs are generally more sensitive than older pigs. For single feed 20kg pigs, the wind speed increased by 5cm per second, and the lower limit of critical temperature increased by 1°C. For group feeding, the lower limit of critical temperature increased by 1°C and the wind speed was 21cm per second. 5. According to the circle area per m21 head, each circle put 10 to 20 pigs 20 ~ 40kg, can make critical dew lower limit lower 2 °C ~ 3 °C, make up the heating can be reduced by 50% ~ 70%. 5. According to the experiment, if the raising level of the pig is increased by 1 maintenance amount, the critical temperature can be decreased by 4°C to 5°C. (B), the impact of lower critical temperature on pig production 1. Piglets during lactation, lower than the critical temperature lower limit of 1 °C, it is necessary to improve the metabolic energy 2% to 5%. 2. Two weaning pigs of the same feed intake reduced 1 in 1 °C at the lower critical temperature, and the daily growth rate decreased by 1 g. Weanling piglets want to achieve growth rates similar to those at the optimum temperature in cold environments. Every drop of 1°C requires 13 grams of additional feed per day. 3. Growing Breeding pigs (finishing pigs), starting from a temperature of 20°C, a decrease of 15g in daily weight gain for every 1°C drop. At the lower limit temperature of the critical temperature of 25°C to 15°C, for every 1°C drop, pigs will increase the metabolic energy of 3g of feed per kilogram of body weight per day to maintain the normal body temperature of the pig. One 20kg heavy pig consumes 60g more. Conclusion: Season has a significant effect on pig growth and feed utilization. At the appropriate temperature (15-27 °C), pigs grow fastest. In winter, the temperature is low, and the survival rate of piglets is low. It is necessary to strengthen the insulation and cold-proof measures. The optimum temperature for growing pigs is 20°C. When the temperature is lowered, pigs are forced to eat more, and most of the feed energy will be used for heat production instead of meat production. This means that each pig will consume 15-33 grams of feed per day for every 1 degree drop. For a 10,000 pig farm, the amount of feed consumed over time is considerable. The influence of the temperature environment on the pigs actually involves a lot and the scope is very large, because the microbial environment and the nutritional environment also change with the temperature and humidity.