Boner

Slaughter cows expected to yield carcasses in the range of 80-85% lean.  Typically a cow with between .15-.35 inches of backfat at the 12th rib.

Breaker

Slaughter cows expected to yield carcasses in the range of 75-80% lean.  Typically a cow with more than .35 inch of backfat at the 12th rib.

Bull

A mature (approximately 24 months of age or older) uncastrated, male bovine.  However, for the purpose of these standards, any mature, castrated, male bovine which has developed or begun to develop the secondary physical characteristics of an uncastrated male also will be considered a bull.

Bullock

A young (under approximately 24 months of age) male bovine (castrated or uncastrated) that has developed or begun to develop the secondary physical characteristics of a bull.