Pig B-ultrasound observation of pregnant sows should use low-energy, high-protein feed to keep the sows in good physical condition. Pig B-ultrasound should be used frequently to observe the physical condition of sows in the late pregnancy. There are a large number of fiber-decomposing bacteria living in the large intestine of pigs, which have a high ability to digest fiber. It is reported that 30% of the energy required for growth and fattening pigs can be provided by volatile fatty acids (VFA) produced by fermentation in the large intestine, and it can be higher in adult pigs. Properly increasing the crude fiber level of the pregnancy diet can increase the feed intake and milk production of sows during lactation. Feeding a high-fiber diet during pregnancy can increase the number of weaned litters by 0.3-0.7 heads, reduce weight loss during lactation, and pig B-ultrasound can observe that the back fat thickness of sows is seriously reduced during this period. Feed intake increases and piglet weaning weight increases. At the same time, it can also extend the reproductive life of sows. Adding wheat straw powder to the diet of pregnant sows can increase the number of piglets at birth and weaning; adding oat hull powder can significantly increase the fat content of colostrum and milk in lactating sows. Adding fiber to the diet can increase the VFA concentration in the sow's blood, especially acetic acid, which can directly synthesize milk fat and increase milk energy. Adding fibrous feed to the diet of pregnant sows can improve the reproductive performance of sows, and it can be observed through pig ultrasound that the thickness of the sow's back fat is not seriously reduced.

Pig ultrasound

Pig ultrasound detection shows that the feed intake of sows during pregnancy is between 1.7-2.3kg/d, which has no significant effect on the total number of piglets, but the elimination rate of sows receiving the lowest level of feed is higher. Experiments have shown that with the increase in feed or energy intake during pregnancy, the birth weight of piglets also increases accordingly. Pig ultrasound observation of fetuses in late pregnancy will find that the size is larger, but when the sow's feed intake increases to more than 25MJ metabolic energy per day, the effect on newborn piglets is not obvious. When the energy standard is lower than 22.5MJ metabolic energy per day, the birth weight of piglets can be reduced by 20%-25%. However, there are also reports that insufficient energy supply to pregnant sows can affect the birth weight of piglets, but will not affect weaning weight and weight gain after weaning. In the late pregnancy, it is important to use pig B-ultrasound to regularly observe the condition of the fetus and sow.

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