Effects of management on sow embryo survival. In the early stages of sow pregnancy, the fertilized egg is implanted into the uterine wall. During this period, the embryo is very sensitive, and any stress may cause the loss of the embryo. When pigs use B-ultrasound to examine early embryos, they will also Discover this phenomenon. Therefore, do not move the sow before at least 28 days of gestation. Keep the environment quiet so that the sow is not disturbed and frightened. Porcine B-ultrasound is often used to check the status of the embryo.

 Effect of length of lactation on subsequent litter size. The length of the lactation period has a significant impact on the size of the next litter. If the lactation period is less than 21 days, the number of sows ovulating is low or even non-ovulating, and the intrauterine environment has not been fully restored. At this time, the number of live litters in the weaned and bred sows will be reduced by 10%-20%. B-ultrasound examination of pigs When looking at the reproductive tract of sows, the condition of the ovaries can be clearly seen. A lactation period of more than 21 days has a significant impact on the number of litters. The optimal weaning period for sows is 21-28 days. During the weaning process, it is important to use Pig B-ultrasound to check the status of the puppies and the mother dog.

 Effects of weaning to breeding interval. The interval from weaning to breeding may be the most important indicator affecting future productivity, especially litter size. The average interval from weaning to breeding is 4-6 days, which can achieve the maximum litter size. This stage also needs to be observed through pig B-ultrasound. Of the many factors that influence this, feed intake during lactation is the most important. High feed intake between weaning and breeding is also necessary for maximum litter size. Feeding 4 times a day or ad libitum, providing plenty of clean water and a hygienic feeding trough will all help achieve this goal. 14-16 hours of light every day will help stimulate sows to come into estrus quickly. Good contact with boars is also an important influencing factor, especially in the first 2-3 days before estrus is expected, the development of follicles can be clearly seen through B-ultrasound examination of pigs.

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