Causes and treatment methods of sows returning to estrus

Sows in estrus after breeding but not pregnant, this phenomenon is called return to estrus, once the pig farm return to estrus rate increases, it will lead to the reduction of breeding and delivery rate, thus affecting the farm benefits, resulting in greater losses. So what is the reason for the return of sows? What should I do? Let's take a look.

1. Boar semen quality is unqualified

Boar semen quality directly affects the conception rate, boar semen quality is poor, it is basically impossible to improve the conception rate of sows, before breeding, it is necessary to check the boar to ensure that semen quality is qualified. In addition, high temperature weather has a great impact on boar vitality, so in summer breeding, we should do a good job of cooling and heatstroke prevention in pigsty, and add anti-stress drugs in drinking water to avoid heat stress reaction caused by high temperature to boar, ensure qualified semen quality and reduce return rate.

2. Improper breeding time

The insemination personnel are not experienced, the pregnancy is not accurate, and the best insemination time is missed, resulting in the failure of sow pregnancy and the return of sow. Generally speaking, the earlier the weaning sow appears in estrus, the longer the estrus duration, the later its ovulation time, whereas the later the weaning sow appears in estrus, the shorter its estrus duration and the earlier ovulation. Therefore, we must do a good job of checking the situation. When the sow is in estrus within one week of weaning, it is good to delay the insemination for 12 hours, while the sow in estrus for more than one week of weaning can be inseminated immediately.

3. Disease factors

Pathological and physiological diseases of sows may cause estrus, which directly invade the reproductive system of sows, lead to disorder of reproductive hormone secretion organs, and lead to termination of pregnancy. Infected diseases in the embryo implantation period after breeding will lead to pregnancy failure, resulting in return to estrus; infected diseases in the late pregnancy may also cause premature delivery and abortion of sows, severe uterine inflammation occurs, affecting the conception rate of the next estrus, resulting in return to estrus. In order to prevent sow infection disease, we should first start from doing a good job of environmental sanitation in pigsty, clean pigsty regularly every day to reduce the breeding of pathogenic microorganisms, and disinfect regularly to ensure the cleanliness of pigsty. For some diseases, vaccination can be taken to prevent and reduce the chance of infection. During breeding, midwifery and postpartum care, operators and tools should be strictly disinfected. Once sow uterine inflammation is found, timely treatment should be carried out.

The above is an introduction to the reasons and treatment methods of sow return, I hope to help you, if you want to know more about relevant knowledge, please pay attention to us.