If it can be judged early that the sow has been conceived, feeding and management should be conducted according to the pregnant sow. If no pregnancy is to be taken, measures should be taken to encourage the sow to re-emotion and to prevent breeding of the sow and cause feed wastage. Therefore, to determine whether a sow is pregnant or not is of special significance to pig production.
According to the determination of the date of pregnancy sooner or later can be divided into early, middle and late.
Early diagnosis:
1 Observe the change of the sow's appearance, such as the shiny coat, the eyes of the gods, and the bright, the joints under the vulva constricted upward to form a line, which means that the pregnancy.
2 iodination method: take about 10 milliliters sow urine into a test tube, with a pycnometer to determine its specific gravity (should be 1.0? 1.025), diluted with too much water, and then drip in iodine in the gas or alcohol lamp heating. 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.
3 After 3-4 days of mating, the second sow of the sow was gently pinched by hand and found to have a harder milk tube, indicating that she had become pregnant.
4 Acupressure method: Use a thumb and a forefinger to force the 9th thoracic vertebra to the 12th thoracic midline at the midline of the thoracic spine. If the sows in the middle of the back show a sag reaction, that means that they are not conceived; Even if it is slightly raised or not moving, it is pregnancy.
Mid-term diagnosis:
1 The sows were no longer in heat for 18-24 days after mating, the appetite increased sharply, no material was left in the trough, and the abdomen gradually increased, indicating that it had become pregnant.
2 Determine the sow 25-30 days after mating with a pregnancy analyzer. The accuracy rate is as high as 98%-100%. 3 Sows had black hair 30 days after mating, and the attachment site of the nipple showed a dark purple halo indicating that they had 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.
Post-diagnosis: Fetal movement can be felt after 70 days of pregnancy. After 80 days, the sow on the abdominal wall of the sow can be seen when the sow is lying on the side. The abdominal circumference is significantly increased, the nipple is thickened, and the breast bulge is the conception of the sow.
The sow’s pregnancy date averaged 114 days.
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