. . . what a “Heifer Bull” is vs. a “Bull”?? Me neither . . . I just thought a bull was a bull. A “Heifer Bull” is a younger bull that is categorized as a bull that will produce a smaller calf (low birth-weight bulls). So when the “Heifers” (females that haven’t yet had a calf) are bred with a “Heifer Bull”, it’s much easier on the Heifers when their first calf is of smaller birth-weight. This is “Big G” . . . . . NOT a “Heifer Bull”.