B-ultrasound examination of pigs shows that sows with a small litter size (15% of sows have less than 7 piglets) are related to breed, parity, hybrid advantage between male and female pigs, age of first mating, mating method, boar fertility and mating ability, frequency of boar use, length of sow lactation, nutritional status of sow feed, and immunity to epidemic diseases.

Embryonic death loss mainly occurs in the first 3 weeks of pregnancy. 6-9 days after mating (rapid elongation of blastocyst) and 13-25 days (before and after implantation of blastocyst) are the most concentrated periods of embryonic loss (accounting for 71% of all embryonic deaths). This may be related to the peak of infection 9-13 days after mating and changes in uterine endocrine balance at 2-3 weeks, as well as early embryo competition for certain special substances in uterine secretions. Therefore, it is necessary to use B-ultrasound to check the condition of sows more than 20 days after mating. Therefore, reducing sow infection and maintaining a relatively constant feeding environment and avoiding stress can improve embryo survival rate and litter size. In addition, since energy is a major factor affecting embryo survival rate, sows must be restricted in feeding within 3 weeks after mating to reduce the interference of progesterone secretion caused by increased adrenaline secretion due to high energy, thereby reducing the impact of embryo implantation. However, short-term good feeding before mating is conducive to increasing ovulation and increasing the number of piglets. Of course, pig B-ultrasound is also needed to check the condition of the reproductive system before mating. In addition, reasonable adjustments should be made to the mating age, parity and length of lactation of sows.

The examination of boar fertility and use, mating methods and genetic factors is also an aspect that cannot be ignored. It is also necessary to use pig B-ultrasound to check the condition of the boar's reproductive system. The content of certain nutrients related to reproduction in feed, such as vitamins A, D, E, H, folic acid and minerals Se, Zn, and essential amino acids such as lysine, must be guaranteed. Strict measures must be taken to control reproductive disorders, and pig B-ultrasound is also a prerequisite for checking the condition of its reproductive system.

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