With the onset of hot summer, the high-heat and high-humidity rearing environment will bring various degrees of harm to the sow production: decrease in feed intake, reproductive barriers or postpartum infections, prolonged delivery time, and increased number of piglets. The direct cause of these hazards is mainly summer heat stress, so adopting some effective and effective countermeasures is the fundamental to prevent heat stress and protect the female pigs from summer.
Heat stress damage to sow production
1. Effect of heat stress on sow reproductive performance. Under heat stress conditions, the sow's endocrine system is dysfunctional, peripheral blood circulation is enhanced, and the intrauterine environment is unbalanced, resulting in pre-pregnancy sows (0 to 30 days of pregnancy) and late pregnancy sows (90 to 114 days of pregnancy). Reduced conception rates, abortions and increased stillbirths; decreased feeding intake of lactating sows, reduced lactation, severe stuttering during weaning, increased ecstasy and regurgitation; increased number of anorexia before gestation sows (more often 10 to 25 days) The birth weight of piglets decreased, the sow's labor duration increased, and stillbirths increased during delivery.
2. Easily induce hyperthermia stress syndrome. The pregnant sow is a special "individual", and the in vitro and in vivo unstable factors (such as heat stress, mycotoxins, allogeneic rejection, etc.) work together to make the pregnant sow body in a "sub-healthy state", at any time. The occurrence of hyperthermia stress syndrome may be caused by a mixed or secondary infection of viruses, bacteria, mycoplasma, parasites, and the like. Years of experience show that sows in most areas tend to have this disease in hot summer months.
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