Postpartum in cows refers to a period of time from the expulsion of the placenta to the restoration of the reproductive organs to their pre pregnancy state, during which the cervix opens when the fetus is born. The surface layer of the birth canal mucosa may cause damage; There is a large accumulation of lochia in the uterus after childbirth. All of these have created conditions for the reproduction and invasion of pathogenic microorganisms. Therefore, postpartum cows should regularly use veterinary ultrasound examination to prevent diseases and ensure normal reproductive function,

The ultrasound examination of the ovaries of cows 15 days postpartum is as follows:

Under normal circumstances, the uterine involution of cows is good, with normal texture and moderate uterine contraction response upon palpation, with faintly visible angular grooves. The cervix is thicker than normal, and the angle of the uterus on the pregnant side is significantly thicker than that on the other side; The texture of the ovary is relatively hard, and the ovary on the gestational side is relatively small, generally irregular and flattened in shape. There is often a degenerated corpus luteum on the ovary, which is small and hard. The contralateral ovary has basically returned to normal size, and a very small number have already started follicular activity.

In abnormal conditions, palpation shows weak uterine contractions, thick uterine walls, thick uterine body and cervix, fluid wave like sensation in the uterine cavity, and poor contractility; The ovaries are small in size and irregular in shape, with no follicular activity.

The results of B-ultrasound and rectal examination of cow ovaries show that the ovarian function of cows has basically recovered from two weeks to about 30 days postpartum. The first ovulation begins around 30 days postpartum, and the uterine involution mainly occurs around 30 days postpartum.

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