According to the determination of the date of pregnancy sooner or later can be divided into early, middle and late.
Early diagnosis:
Observe the changes in the shape of the sow, such as the shiny coat, the eyes of God, shiny, the joints under the vulva contraction of the upward contraction to form a line, it means that pregnancy.
Iodination method: Take about 10 ml of sow urine into a test tube, determine its specific gravity with a pycnometer (should be 1.0?1.025), dilute it with too much water, and then drip in iodine on a gas or alcohol lamp. Color change occurs when the urine reaches the boiling point: urine appears red from top to bottom, indicating that it is pregnant; light yellow or brownish green indicates that it is not pregnant.
Three to four days after sow mating, the second pair of nipples were gently pinched by hand and found to have a harder milk tube, indicating that they had become pregnant.
Acupressure method: Use the thumb and the index finger to squeeze the 9th thoracic vertebra to the 12th thoracic midline of the sow. If the sow in the middle of the back refers to the depression reaction, it indicates that there is no conception; if the finger pressure does not show depression reaction, Even slightly raised or not moving, it is pregnancy.
Mid-term diagnosis:
After the sow is mated, the estrus will no longer occur 18-24 days later. The appetite will increase sharply. There will be no leftover material in the trough, and the abdomen will gradually increase, indicating that it has become pregnant.
The accuracy of the sows after 25-30 days of mating was measured with a pregnancy meter as high as 98%-100%.
30 days after sow mating, the hair is black, and the attached part of the nipple shows a dark purple halo indicating that it has become pregnant. When looking at the arrangement of the sow's nipples from the rear side, the nipples open outwards and the mammary glands bulge, which can be used as an auxiliary test for pregnancy.
Late diagnosis:
Fetal movement can be felt after 70 days of gestation. Fetus movements that touch the sow's abdominal wall can be seen after 80 days of gestation. The abdominal circumference is significantly increased, the nipple is thickened, and the breast bulge is when the sow has been conceived.
The sow’s pregnancy date averaged 114 days.
Detection of pregnant sows have a coup to provide reference
Pregnancy during sow mating has been a headache for most farmers. After years of practice with farmers, it has been found that using sow urine to verify pregnancy is a simple and reliable method for farmers.
Take 15 ml of fresh urine from the morning sow 8 to 10 and place it in a transparent glass bottle. Drop a few drops of vinegar or a small amount of iodine into a glass bottle filled with urine. Place the glass bottle on a small fire and gradually warm it until the urine boils. Observe the color of the urine to determine if the sow is pregnant. If the urine is red, the sow is pregnant. If the urine is light yellow or brown green, and the color disappears immediately after cooling, the sow is not pregnant.
1. If the sow returns to her condition within 18 days after mating (18 to 19), it means that the breeding is too late.
2. If the sow returned to her condition 22 days after mating (23 to 24), the mating is too early.
3, if the return within 21,22,23 days after mating, indicating that the breeding fails, need to check the quality of semen.
4. If you return to love within 39-45 days after mating, it means that you missed the last estrus cycle and you need to check the method of detection.
5, if the return within 25 to 38 days after mating, outside the normal range. Sows are pregnant but cannot conceive
May be due to: 1 stress. 2 Moldy feed. 3 There are too few eggs for pregnancy. 4 Uterine infection.
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