[Vibration of the uterine arteries during pregnancy in cows]

A clinical examination was carred out via the rectum to follow up the initial moment of vibration as established on the medium and rear uterine arteries in a total of 410 cows of the Bulgarian Brown breed by groups of first to eighth pregnancy. The vibration of the uterine arteries may serve as a good clinical sign to determine the age of the fetus. The following more important conclusions were drawn: 1. The uterine arteries start vibrating as pointed below: a. uterina media--in the pregnant horn from the 93rd to the 142nd day (on the 122.2 +/- 0.57 day); in the unpregnant horn from the 167th to the 210th day (on the 188.2 +/- 0.54 day, on an average); a. uterina caudalis--in the pregnant horn from the 200th to the 248th day (222.6 +/- 0.54 day, on an average); in the opposite horn from the 235th to the 279th day (256.7 +/- 0.55, on an average). 2. The initial moment of vibration of the uterine arteries is dependent on the number of previous births. 3. Closest to the average values are those established at the fourth and fifth pregnancy. At the previous pregnancy periods vibration starts earlier, and at the following ones--later.