For sow fat, B-ultrasound is used for pig testing. If the fat is not well controlled and is fat in the middle of pregnancy (30-75 days), then the sow will be fat at delivery, because it is impossible to control feed and reduce fat in the late pregnancy, which will lead to low feed intake of lactating sows and affect production performance. The thickness of back fat detected by B-ultrasound in pigs will be very large. If pregnant sows provide the quality and quantity of newborn piglets, then lactating sows provide the quality and quantity of weaned piglets. Therefore, the high yield of sows does not only refer to the number of weaned piglets provided per year, but also includes the weaning weight. Moreover, if a sow only provides 20-30 weaned piglets in its lifetime, is it called high yield? Definitely not. Such sows are eliminated in 3-4 litters, and the production potential of sows is to provide 60-70 weaned piglets in their lifetime. Therefore, to achieve high yield, it means providing a large number of weaned piglets per year, heavy weaning weight, and long service life.

It requires systematic thinking and accurate nutrition. Pigs use B-ultrasound to check the backfat thickness regularly to guide the feeding amount. The traditional two-stage feeding method is just a simple feed with two nutrient concentrations (due to price reasons, pregnancy feed and lactation feed are often different brands). The nutritional needs of sows at different stages and different production results are not taken into account, and the systematic nature of sow production is not taken seriously enough. Therefore, it is very important to frequently use pig B-ultrasound to monitor the backfat thickness to guide the feeding method.

Low energy and low protein in the early pregnancy, medium energy and medium protein in the late pregnancy, reduce sow constipation, and prepare for the maximum feed intake during lactation. The pregnancy period is divided into the early pregnancy (0-90d) and the late pregnancy (90d to the delivery bed). The early pregnancy focuses on controlling fat condition and solving constipation. It is important to use pig B-ultrasound to detect backfat thickness. In the late pregnancy, constipation is solved and fetal development is promoted. By eliminating constipation, sows are healthy and newborn piglets are strong.

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