Occurrence and Regulation of Heat Stress in Pigs

Pigs are warm-blooded animals. It has been reported that the ambient temperature of the air exceeds 28°C. For every 1°C increase, the weight gain of each pig is reduced by 30 grams, and pigs, medium pigs, and large pigs are reduced by 6.8% from the normal daily weight gain. 20% and 28%. It can be seen that adopting a comprehensive regulation strategy in the high temperature season to reduce the impact of high temperature stress on pig growth is one of the core contents of pig production in summer.

First, the clinical manifestations of high temperature heat stress

Pigs have reduced appetite, increased body temperature, lack of energy, rapid heartbeat, shortness of breath, and even hot gasps. The loss of libido in boars has drastically reduced sperm counts and decreased vitality. Empty sows do not have estrus or estrus or are often infertile. Pregnant sows have high embryo mortality and miscarriage. Excessive body temperature in sows may cause premature birth or even death. Nursing sows have low feed intake, low milk production, light weight of piglet weaning, and low survival rate.

Second, comprehensive control of high temperature heat stress

1. According to the appropriate ambient temperature range for pigs at different stages of growth and development, do a good job of preventing heatstroke and cooling, and improve environmental conditions. 1 Strengthen ventilation in pig houses. 2 Reduce thermal radiation, including direct solar radiation and infrared radiation. In order to reduce heat radiation, it is recommended that tall arbors be planted around pig houses, and shading nets be added if necessary. 3 increase the evaporation of pig body heat, although there is no sweat glands in pigs, but can be wetted by the surface to achieve the purpose of evaporation. It is recommended to cool the pigs at the hottest time of the day (conditional spray equipment can be installed, and unconditional pig farmers can use water pipes to cool the big pigs). 4 Newly built pig houses are recommended to install a floor cooling system. This kind of cooling system refers to a conductive cooling method that uses underground water as a medium to lay multiple drainage pipes under the floor of the pig lying area. It is suitable for groundwater sources and can be used to drill wells. Area.

2. Ensure clean and adequate drinking water, and keep the water temperature as cool as possible to prevent the water pipes and tanks from being exposed to the sun, resulting in too hot drinking water.

3. Reasonably adjust feed formulation, properly increase feed nutrient concentration, and maintain feed freshness and palatability.

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