What are the effects of heat stress on sows

(1) The effect of heat stress on the reproductive system of pigs: heat stress, sows show ovarian dysfunction, decreased conception rate, the number of stillbirths at the end of gestation increases, litter weight decreases, and even abortion. Pregnant sows are susceptible to anonymous high fever, heat stroke and other diseases in summer, which can seriously lead to death of pregnant sows with gastrointestinal torsion; empty sows can cause breeding infertility or abnormal return of sows to estrus; delayed primiparity and sexual maturity of reserve sows, delayed oestrus in sows, cryptic oestrus or even no oestrus. According to statistics, when the temperature reaches above 32℃ when sows are mated, about 20% of the pigs are infertile or repeat oestrus, and the abortion rate increases. Sows suffering from heat stress 8 days after mating and 11~20 days after embryo attachment as well as in the late gestation period (after 100 days) can suffer from serious reproductive problems, with a decrease in the number of litters and live piglets in the summer, a decrease in the lactation of sows, poor growth of suckling pigs, low survival rate, and small body weight of weaned piglets.

(2) The effect of heat stress on the feed intake of sows: pregnant sows reduce feed intake, affecting the fetal weight at birth. Lactating sows feed less, affecting milk secretion. At present, the dietary energy level of lactating sows is generally 12.12~12.54MJ/kg, and due to the high temperature in summer, the average feed intake of sows is about 4.0kg. Therefore, the energy intake can not meet the needs of lactating sows for milk production. Throughout the lactation period, sows need to use the nutritional reserves in the body to meet the nutritional requirements for milk production. The use of too much nutritional reserves in the body will lead to serious fat loss in sows, affecting the estrus of the next litter. It is reported that for every 1℃ rise in temperature, the feed intake of pig drops about 40g, and if the ambient temperature exceeds the optimal temperature by 5~10℃, the feed intake will drop by 200~400g per day.

(3) The effect of heat stress on the delivery of sows: Sows delivering piglets in the month of May~October when the ambient temperature is high will have higher stillbirth rate than that of the month when the ambient temperature is low, and the average rate of stillbirth is higher than that of the month when the ambient temperature is low, by 0.3~0.4 head per litter. The main reason for this is the prolongation of the farrowing process of sows due to the high temperature in summer. In summer, due to high temperature, sows are affected by heat stress, and the body secretes too much stress hormone - adrenaline. Adrenaline causes uterine vasoconstriction, which reduces the oxytocin reaching the uterine smooth muscle, and the uterine muscle doesn't get enough oxygen, resulting in a decrease in the frequency and intensity of uterine contractions, which results in a prolonged delivery time. At the same time, accelerated respiration causes a large amount of calcium ions to be lost from the body, and the contraction strength of the muscles is closely related to the concentration of calcium ions within a certain range, such as the delivery of sows with too little calcium in the body, regardless of whether or not there is oxytocin, the uterine muscles will no longer play their role, and it is easy to give birth to a weak piglet; when there is a serious lack of calcium, the neuromuscular stress will be elevated, and muscle spasms will form, resulting in stagnant labor, an increase in the number of stillbirths, the fetal coat is not small , the probability of postpartum infection rises; it also leads to postpartum milk production or no milk, constipation, delayed recovery of the uterus, and an increase in return to love.

In order to solve the summer high temperature and high humidity harm to the breeding industry, now the company launched for such a situation of efficient products - cool a summer

Cool a summer

Main ingredients:

Betel nut, camphor, mint, ice, lemon, citric acid, fenugreek acid, a variety of vitamins, BLCS, biological antitoxin.

Functions and Indications:

1. Used for high fever caused by wind-heat cold, heat stroke and heat stress.

2. It is used for a series of symptoms such as excessive internal heat, increased endotoxin, open mouth panting, decreased feed intake, dry feces, increased thirst and so on caused by high temperature and high humidity in summer.

3. It is used for the prevention of post-partum triad (endometritis, mastitis, postpartum paralysis) in sows in summer.

Product efficacy

1.Anti-stress, preventing stress reaction caused by transportation, fright, group transfer, beak breaking, vaccination, drug injection, sudden change of climate and so on.

2, cooling heat, resisting heat stress, increasing feed intake, preventing and controlling heatstroke death of pigs caused by high temperature and humidity in summer. It can make livestock and poultry fatten and can improve the carcass grade, and it can increase egg production and improve eggshell quality for egg birds; prevent heat stroke death.

3, to promote the growth of antibodies, enhance immunity, improve disease resistance, used in disease adjuvant treatment, accelerate the recovery of the body.

4, detoxification, used in the auxiliary treatment and prevention of toxic diseases.

5, hemostatic, anti-allergic accelerate wound healing; prevent scurvy.