Written by Glenn Selk, PhD. Beef Cattle Specialist Emeritus with the Oklahoma Cooperative Extension Service.
Now we have another good excuse to cull cows due to bad temperament. Producers that routinely breed cows artificially realize that cows that are unruly and nervous are less likely to conceive to artificial insemination. Presumably, the lowered conception rates were because they have been stressed as they are passed through the working facilities and restrained while being synchronized and inseminated. Research trials indicate, even in the serenity of a natural breeding pasture, cows with bad dispositions are less likely to conceive when mated with bulls.
Image: IBEX® EVO® + L7HD, in a Holstein cow
Mummification in bovine fetuses has an incidence of less than 2%. It occurs when there is fetal death for any number of reasons (Trichomoniasis and BVD infections have been specifically implicated as causes), but the CL is retained, the cervix stays closed, and there is no bacteria or oxygen present in the uterus to cause maceration.
If you’re new to ultrasound, an image may look like nothing more than a swirling array of grey tones on the screen. Interpretation requires an understanding of anatomy and physiology, but also of how ultrasound technology functions.
Consider the sonar produced by a bat in flight. The bat emits high frequency sounds, which then bounce off of objects in its proximity and return to the bat. The animal uses the strength, direction, and timing of the returning sound to determine where those objects are and to avoid a collision.