Different breeds and the same variety of pigs with different production performance have different sensitivity to environmental temperature. The basic rule is that the better the production performance is, the worse the stress resistance is and the more sensitive the uncomfortable ambient temperature is. Because the back-thin pigs are easy to dissipate, the temperature requirements are harsh, and the larger the body surface area of ​​the pig (the longer the body), the easier it is to lose heat.
At present, the breeders raised domestically are Dika, Pietrain, PIC, and Sanyuan; cross-breeding pigs are mostly ternary; local pigs, that is, local pigs. In contrast, good breed pigs have relatively high growth performance and require high ambient temperature.
Good breed pigs: Decca, Pietrain, PIC, Trio
Among the above breeds, Pietland and Landrace are particularly sensitive to the requirements of the ambient temperature. Relatively speaking, PIC's tolerance to the environment is slightly better, but its nutritional requirements are high. In summer, Pieton and Landrace sows are relatively more vulnerable to high temperatures, and they must try their best to provide them with a good living environment to obtain better breeding results. At present, the breeds raised on large-scale farms in China are mainly based on the above varieties. The living environment of pigs can basically meet the requirements. Therefore, the loss of large-scale pig farms during the outbreak of high-calorie fever last year was relatively small. In these farms, the cost of rearing accounts for about 70% of the total cost. Some of the costs are used to control the temperature of the pig's living environment, so as to ensure feed efficiency and maximize the overall economic performance.
Hybrid pigs: internal ternary
Relatively speaking, the requirements of the breeding environment for the ternary crossbred pigs are slightly broader, and they are more suitable for the environmental conditions in our country's sheds. At present, most of China's small and medium-sized farms (households) are basically based on the three-way cross-breeding pigs, but due to the restrictions on the capital strength and feeding concepts of these farms, the general breeding density is very large, and there is no good insulation With cooling measures, the pig disease epidemic last year occurred in such pig farms. Such a farm (household) usually spends about 80% of the funds for feeding, but seldom invest in the improvement of the ambient temperature of the pig house. Do you not know that pigs not only fail to exert their maximum production potential in harsh environments, but also have the greatest risk of affecting the health of pigs due to environmental stress, thereby increasing the risk of farms.
Local Pig: Soil Pig
Rehabilitated households and many small and medium-sized farms prefer to raise pigs. Due to the low density of rearing, pigs are more tolerant and have fewer incidences. Pig farms accompanied by pigs are all earth circles. The pigs themselves can make some adjustments through behavior, and the environmental temperature requirements are very low. However, because of the drawbacks of the pigs themselves (low feed remuneration and slow weight gain), these farms (households) have poor economic returns and are gradually withdrawing from the market.
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