. Cow age was also investigated as a classification variable with levels that were a modification of the Beef Improvement Federation guidelines (BIF, 2010): 3-yr-olds, 4-yr-olds, 5-yr-olds, 6- through 10-yr-olds, and older than 10 yr.
. Cow age was also investigated as a classification variable with levels that were a modification of the Beef Improvement Federation guidelines (BIF, 2010): 3-yr-olds, 4-yr-olds, 5-yr-olds, 6- through 10-yr-olds, and older than 10 yr.