Treatment method of return to estrus in sows

First of all, we can find out the reason for the sow's love, and then we can find a way to deal with it. Generally speaking, the reasons for sows returning to love are untimely mating time, poor semen quality of breeding boars, mating failure of breeding boars, careless mating hygiene, delayed or anovulatory ovulation in sows, hysteritis in sows, high temperature or fever in sows, administrative stress, hereditary causes and so on. The reasons for returning feelings are different and the ways to deal with them are different.

1. The time of mating is not right.

The best time for sows to breed is 6-18 hours before ovulation, neither too early nor too late. If the sows return to estrus within 20 days after mating (18-19 days), it is too late for mating; if the sows return to estrus after 22 days (23-24 days), the mating is too early. In the future, we should improve the signing of estrus and grasp the best time to lose estrus.

2. The semen quality of breeding boar is not good.

Semen quality is one of the main factors affecting the conception rate. If the semen quality of breeding boars is not good, mating will fail and sows will return to love. The semen quality needs to be checked before each mating to ensure that the semen quality is qualified.

3. Breeding boar failed to mate.

Some boars may suffer from reproductive system diseases and may not ejaculate even if they mate. Since there is no ejaculation, sows will return love if they fail to breed. It is necessary to choose healthy and disease-free boars with the same testicular size, symmetrical arrangement and obvious male characteristics.

4. Do not pay attention to breeding hygiene

If you do not pay attention to hygiene when mating sows, it may cause uterine inflammation in sows. For example, hand contact with the front end and foam head of the vas deferens may contaminate the vas deferens, or if the vulva of an estrous sow is exposed to sewage, it may be absorbed into the uterus through the capillarity of the vaginal wall. During breeding, the vulva of sows should be cleaned and fully wiped with sterilized paper towels.

5. Delayed ovulation or anovulation in sows

If the sow ovulates slowly, it will cause the injected sperm to lose its ability to fertilize; if it does not ovulate, the sow will not be able to conceive. It is suggested that 1% Liuming No.1 should be added 7 days before mating and 10 days after mating to promote oestrus and increase ovulation rate and conception rate of sows.

6. Sow hysteritis

Sow hysteritis is the main cause of sow infertility, it will hinder the movement and survival of sperm, thus hindering fertilization. To do a good job of sow prevention and health care, usually do a good job of epidemic prevention, artificial insemination to do a good job of cleaning and disinfection, in order to prevent uterine inflammation. If sow uterine inflammation is found, it should be treated in time.

7. the temperature is too high or the sow has a fever

The embryo implantation period is 14-25 days after mating. If the sow is subjected to heat stress or fever within 14 days, it will change the composition of uterine milk, cause the embryo to die before implantation and cause the sow to return to estrus. If exposed to heat stress or fever for 12 to 24 days or even 35 days, the embryo implantation or the death of the implanted embryo will be affected, thus causing the sow to return to love. To do a good job in the prevention and health care of sows, it is also necessary to create a comfortable living environment for sows.

8. Management stress

If confronted with stress such as fighting, hurdling and transportation, the adrenaline secretion of sows will be increased, which will affect the composition of uterine milk and lead to the death of embryos. Therefore, it is necessary to do a good job in the management of sows, without fighting, hurdling, transportation and other actions or actions.

9. Genetic causes

If the embryo is dysplastic and can not be implanted normally, it will lead to the failure of sow mating and sow regurgitation. To grasp the best time for insemination, so that sperm, eggs in the best time to combine, do not miss the best time to combine and lead to forced fertilization.