(A) The influence of temperature The pig's ability to regulate temperature is particularly poor. They have very few sweat glands that can be adjusted on hot days, and there are very few hairs that resist the cold of the winter season. Therefore, the pig house must have good thermal insulation effect and must be regulated by a ventilation system. The temperature should be kept in the initial range to make the pig feel comfortable and the production performance is kept at its best. Above or below this temperature, pigs will develop a stress response and feed efficiency will decrease. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

When the temperature is between 20-28 ° C, the growth of the fattening pigs in the pig house requires an increase of 209.2 kJ per day. At 12-20 ° C, for every 1 degree reduction, the energy needs to be increased by 418.4 kJ or more per day. This means that each pig will consume an additional 15 to 33 grams of feed per day. If a pig house is filled with pigs, the amount of feed consumed will be considerable over time. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

Temperature is the main influencing factor of heat loss rate, and other environmental factors and pig's own characteristics play a significant role in the pig's thermal comfort. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

The following factors can increase heat loss: JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

1. Air movement; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

2. Wet and dirty ground; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

3. Insulation performance is not good; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

4. Eat a lot of cool liquid. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

The following factors can reduce heat loss: JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

1. Provide bedding; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

2. Increase the density of pigs; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

3. Subcutaneous fat; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

4. Radiant heat; JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

5. A fixed partition that can regulate or block air flow. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

Monitor pigs' responses over a range of temperatures to determine if they are comfortable. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

(2) Crowding factors The overcrowding of growing pigs can significantly impair the performance of pigs. Feed intake, weight gain and feed efficiency of growing pigs. There will be varying degrees of reduction depending on the severity of the congestion and the crowded environmental conditions. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

(III) Influence of the number of pigs The experiment proves that under the condition of house feeding, the production performance of pigs with small pig population density is obviously improved, and the phenomenon of tail biting and fighting is also greatly reduced. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

(IV) Impact of good management In modern high-density production, there are quite a few opportunities between people and pigs. These close proximity to each other leads to complex social relationships that are being established between humans and pigs and that need to be cared for and dealt with. Observations on commercial farms show that the range of intimacy between humans and animals is unwilling to approach people and is in a state of stress for a long time. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry

Being kind to pigs pays off. Studies in Australia have found that the way livestock staff handle pigs has a significant impact on the level of fear exhibited by pigs. Aversion or rude treatment (slap, kick or impact) can affect pig behavior and productivity. When pigs are treated harshly, their fear of people increases. The result is a decrease in the growth rate of piglets. JQ2 China Feed Industry Information Network - based on feed, serving animal husbandry