1. Ultrasonic Pregnancy Tester: For sows 25 to 30 days after mating, the correct use of pregnancy tester identification, the accuracy rate of 98.5%. (1) Check the pregnancy instrument is working properly. Press the [ON" button on the front center of the pregnancy instrument with your thumb to hear a tone, which means that the instrument is working properly. (2) Test time. The earliest test can be conducted within 18 days of mating, and no later than 75 days after sow mating. Usually measured 30 days after mating, as long as the correct use of pregnancy test method, the accuracy rate of pregnancy diagnosis of more than 98.5%. (3) Test methods. Before testing, smear the probe and measurement site of the pregnancy instrument with paraffin oil (or vegetable oil, engine oil) so that the probe is in good contact with the skin to ensure the accuracy of the measurement. When testing, it is best to calm the sow (tested during feeding) and place the probe on the right side of the sow to be diagnosed, 3 cm on the base line of the nipple, and 5 cm at the front edge of the sow of the sow. Align the sow's body to scan the uterus, scan the front 45 degrees, and scan 45 degrees to the side (aligning the left front shoulder). When the pregnancy instrument emits a continuous "tap--" tone, it means that the sow has become pregnant; when the intermittent "sputum, fleas, fleas, and fleas" is issued, it means that the sow is not pregnant.
2. Observing method: Let a boar walk around in front of the sows in 18 to 24 days after mating, and it is a good way for the estrus to check the behavior of the sow. Sows no longer have estrus at about 21 days after mating, and can initially be judged to be pregnant. When the second estrus cycle is still not in estrus, the sow has been conceived. Behavioral characteristics: Quiet, snooty, easy to lick, abdominal circumference gradually increased; nipple began to darken, gently elongated nipples, nipples at the base of the nipple appear black purple; from the rear of the sow to observe the arrangement of nipples between the two hind legs It can be seen that the front of the nipple opens outwards, and the base of the nipple expands and rises. The performance of individual piglets is also not necessarily pregnancy, as noted above. In addition, the pregnant sow is shiny and shiny, and her eyes are bright and shiny, and the joints under the vulva contract upwards into a line.