Ultrasound Technology is Revolutionizing Genetic Selection in Beef Cattle
By Harlan Ritchie, Distinguished Professor of Animal Science, Michigan State University
Chianina Journal
A technology that was first adopted by the U.S. Navy in World War II as a means of detecting enemy submarines is now revolutionizing genetic selection for meat characteristics in beef cattle. The technology is ultrasound. It involves the emitting of sounds waves that bounce back when hitting different tissues in the live animal, resulting in an image of the tissues. This image can then be used to quantitatively measure the amount of each tissue in the animals’ body.
The measurements generally taken are: 1) thickness of the outside layer of fat measured in inches; 2) area of the ribeye (loin) muscle measured in square inches; and 3) percent of intramuscular fat (marbling) that is contained within the ribeye muscle. Fat thickness and ribeye area together provide an accurate estimate of the percent of lean meat versus the amount of fat in the animal’s carcass. Measuring the degree of marbling is important because it is closely related to the juiciness, flavor and tenderness of the meat. Lower marbling means a less desirable eating experience, whereas higher marbling means a more desirable eating experience.
