Sonographic Characteristics Of Non-pregnant And Pregnant Sows

   The unpregnant uterus angle is located before and after the bladder and the anterior inferior part.The urine in the bladder is liquid and does not reflect the ultrasound,its sonogram presents the regular dark area.The ultrasonic reflection of the wall of the unpregnant uterus horn is weak, and the sonograms of its section is irregular weak reflection area, and the reflection of the outer membrane of the cornua uteri is not strong, so we should pay attention to the boundary of the section so as to distinguish it from the section of the intestinal canal.Gestational sac appears in the uterus of early pregnancy, also known as pregnancy sac contains early fetal water, the quantity is very small, and does not produce the reflection to the ultrasound to present the small circle dark area.The diameter of dark area was less than 1.0 cm or more than 1.0 cm after 19 days and 20 days after breeding.Usually a dark area, sometimes two or three adjacent dark areas, located in the anterior inferior part and lower part of bladder dark area.With the progress of pregnancy, the area of dark area expands continuously, showing multiple irregular circular dark areas with different sizes or long strip dark areas with blunt circles at both ends.

Sonographic characteristics of non-pregnant and pregnant sows

   After 21 days of pregnancy, the embryo body could be scanned in the dark area of the uterus, showing elliptical weak reflex, and the bright spot of regular and rapid flickering could be observed in the embryo body at the same time, which was the fluctuation of the embryo heart, and the weak reflex could be determined as the living embryo.After 26 days of gestation, the embryo gradually showed the inherent outline of the fetus, fetal head, body and limbs.After 39 days of gestation, fetal bone reflex was enhanced and fetal movement was observed.Then the reflected-enhanced bones gradually appear in the sound shadow.After 47 days of pregnancy, the liver and stomach of the fetus can be observed gradually.The changes of these sonograms can indicate the early development of the fetus and provide a scientific basis for the differentiation of stillborn fetus.