§ 54.106 - Specifications for official United States standards for grades of carcass beef (quality-steer, heifer, cow).

(a) Prime. (1) Depending on their degree of maturity, beef carcasses possessing the minimum requirements for the Prime grade vary in their other indications of quality as evidenced in the ribeye muscle. Minimum quality characteristics are described for two maturity groups, which cover the entire range of maturity permitted in the Prime grade.

(2) Carcasses in the younger group range from the youngest that are eligible for the beef class to those at the juncture of the two maturity groups, which have slightly red and slightly soft chine bones and cartilages on the ends of the thoracic vertebrae that have some evidence of ossification. In addition, the sacral vertebrae are completely fused and the cartilages on the ends of the lumbar vertebrae are nearly completely ossified. The rib bones are slightly wide and slightly flat and the ribeye muscle is light red in color and is fine in texture. In carcasses throughout the range of maturity included in this group, a minimum slightly abundant amount of marbling is required (see Figure 1) and the ribeye muscle is moderately firm.

(3) Carcasses in the older group range from those described above as representative of the juncture of the two groups to those at the maximum maturity permitted in the Prime grade, which have chine bones tinged with red and cartilages on the ends of the thoracic vertebrae that are partially ossified. In addition, the sacral vertebrae are completely fused, the cartilages on the ends of the lumbar vertebrae are completely ossified, and the cut surface of the lean tends to be fine in texture. The minimum degree of marbling required increases with advancing maturity throughout this group from minimum slightly abundant to maximum slightly abundant (see Figure 1) and the ribeye muscle is firm.

(4) Beef produced from cows is not eligible for the Prime grade.

(b) Choice. (1) Depending on their degree of maturity, beef carcasses possessing the minimum requirements for the Choice grade vary in their other indications of quality as evidenced in the ribeye muscle. Minimum quality characteristics are described for two maturity groups, which cover the entire range of maturity permitted in the Choice grade.

(2) Carcasses in the younger group range from the youngest that are eligible for the beef class to those at the juncture of the two maturity groups, which have slightly red and slightly soft chine bones and cartilages on the ends of the thoracic vertebrae that have some evidence of ossification. In addition, the sacral vertebrae are completely fused and the cartilages on the ends of the lumbar vertebrae are nearly completely ossified. The rib bones are slightly wide and slightly flat and the ribeye muscle is moderately light red in color and is fine in texture. In carcasses throughout the range of maturity included in this group, a minimum small amount of marbling is required (see Figure 1) and the ribeye muscle may be slightly soft.

(3) Carcasses in the older group range from those described above as representative of the juncture of the two groups to those at the maximum maturity permitted in the Choice grade, which have chine bones tinged with red and cartilages on the ends of the thoracic vertebrae are partially ossified. In addition, the sacral vertebrae are completely fused, the cartilages on the ends of the lumbar vertebrae are completely ossified, and the cut surface of the lean tends to be fine in texture. In carcasses throughout the range of maturity included in this group, a minimum modest amount of marbling is required (see Figure 1) and the ribeye muscle is slightly firm.

(c) Select. (1) For carcasses throughout the range of maturity permitted in the Select grade, the minimum degree of marbling required is a minimum slight amount (see Figure 1) and the ribeye may be moderately soft.

(2) Carcasses in the maturity group permitted range from the youngest that are eligible for the beef class to those at the juncture of the two youngest maturity groups, which have slightly red and slightly soft chine bones and cartilages on the ends of the thoracic vertebrae that have some evidence of ossification. In addition, the sacral vertebrae are completely fused and the cartilages on the ends of the lumbar vertebrae are nearly completely ossified. The rib bones are slightly wide and slightly flat and the ribeye muscle is slightly light red in color and is fine in texture.

(3) Carcasses in the older group range from those described above as representative of the juncture of the two groups to those at the maximum maturity permitted in the Select grade, which have chine bones tinged with red and cartilages on the ends of the thoracic vertebrae that are partially ossified. In addition, the sacral vertebrae are completely fused, the cartilages on the ends of the lumbar vertebrae are completely ossified, and the cut surface of the lean tends to be fine in texture. The minimum degree of marbling required increases with advancing maturity throughout this group from a minimum slight amount to a maximum slight amount (see Figure 1) and the ribeye muscle may be slightly soft.

(d) Standard. (1) Depending on their degree of maturity, beef carcasses possessing the minimum requirements for the standard grade vary in their other indications of quality as evidenced in the ribeye muscle. Minimum quality characteristics are described for two maturity groups which cover the entire range of maturity permitted in the Standard grade.

(2) Carcasses in the younger group range from the youngest that are eligible for the beef class to those at the juncture of the two maturity groups, which have slightly red and slightly soft chine bones and cartilages on the ends of the thoracic vertebrae that have some evidence of ossification. In addition, the sacral vertebrae are completely fused and the cartilages on the ends of the lumbar vertebrae are nearly completely ossified. The rib bones are slightly wide and slightly flat and the ribeye muscle is slightly dark red in color and is fine in texture. In carcasses throughout the range of maturity included in this group, a minimum practically devoid amount of marbling is required (see Figure 1) and the ribeye muscle may be soft.

(3) Carcasses in the older group range from those described above as representative of the juncture of the two groups to those at the maximum maturity permitted in the Standard grade, which have chine bones tinged with red and cartilages on the ends of the thoracic vertebrae that are partially ossified. In addition, the sacral vertebrae are completely fused, the cartilages on the ends of the lumbar vertebrae are completely ossified, and the cut surface of the lean is moderately fine in texture. The minimum degree of marbling required increases with advancing maturity throughout this group from minimum practically devoid to maximum practically devoid (see Figure 1) and the ribeye muscle may be moderately soft.

(e) Commercial. (1) Commercial grade beef carcasses are restricted to those with evidences of more advanced maturity than permitted in the Standard grade. Depending on their degree of maturity, beef carcasses possessing the minimum requirements for the Commercial grade vary in their other indications of quality as evidenced in the ribeye muscle. Minimum quality characteristics are described for the youngest and the most mature of these groups. The requirements for the intermediate group are determined by interpolation between the requirements indicated for the two groups described.

(2) Carcasses in the youngest group permitted in the Commercial grade range from those with indications of maturity barely more advanced than described as maximum for the Standard grade to those with moderately hard, rather white chine bones and with cartilages on the ends of the thoracic vertebrae that show considerable ossification but the outlines of the cartilages are still plainly visible. In addition, the rib bones are moderately wide and flat and the ribeye muscle is moderately dark red and slightly coarse in texture. The minimum degree of marbling required increases with advancing maturity throughout this group from a minimum small amount to a maximum small amount (see Figure 1) and the ribeye muscle is slightly firm.

(3) The youngest carcasses in the most mature group included in the Commercial grade have hard, white chine bones and the outlines of the cartilages on the ends of the thoracic vertebrae are barely visible, the rib bones are wide and flat, and the ribeye muscle is dark red and coarse in texture. The range in maturity in this group extends to include carcasses from the oldest animals marketed. The minimum degree of marbling required increases with advancing maturity throughout this group from a minimum moderate amount to a maximum moderate amount (see Figure 1) and the ribeye muscle is firm.

(f) Utility. (1) Depending on their degree of maturity, beef carcasses possessing the minimum requirements for the Utility grade vary in their other indications of quality as evidenced in the ribeye muscle. Carcasses within the full range of maturity classified as beef are included in the Utility grade. Thus, five maturity groups are recognized. Minimum quality requirements are described for three of these groups—the first or youngest, the third or intermediate, and the fifth or the most mature. The requirements for the second and fourth maturity groups are determined by interpolation between the requirements described for their adjoining groups.

(2) Carcasses in the first or youngest maturity group range from the youngest that are eligible for the beef class to those at the juncture of the first two maturity groups, which have slightly red and slightly soft chine bones and cartilages on the ends of the thoracic vertebrae that have some evidence of ossification. In addition, the sacral vertebrae are completely fused and the cartilages on the ends of the lumbar vertebrae are nearly completely ossified. The rib bones are slightly flat and the ribeye muscle is slightly dark red in color and fine in texture. In carcasses throughout the range of maturity included in this group, the ribeye muscle is devoid of marbling and may be soft and slightly watery.

(3) Carcasses in the third or intermediate maturity group range from those with indications of maturity barely more advanced than described as maximum for the Standard grade to those with moderately hard, rather white chine bones and with cartilages on the ends of the thoracic vertebrae that show considerable ossification but the outlines of the cartilages are still plainly visible. In addition, the rib bones are moderately wide and flat and the ribeye muscle is dark red in color and slightly coarse in texture. The minimum degree of marbling required increases with advancing maturity throughout this group from minimum practically devoid to maximum practically devoid (see Figure 1) and the ribeye muscle may be moderately soft.

(4) The youngest carcasses in the fifth or oldest maturity group have hard, white chine bones and the outlines of the cartilages on the ends of the thoracic vertebrae are barely visible, the rib bones are wide and flat, and the ribeye muscle is very dark red in color and coarse in texture. The range in maturity in this group extends to include carcasses from the oldest animals produced. The minimum degree of marbling required increases with advancing maturity throughout this group from a minimum slight amount to a maximum slight amount (see Figure 1) and the ribeye muscle is slightly firm.

(g) Cutter. (1) Depending on their degree of maturity, beef carcasses possessing the minimum requirements for the Cutter grade vary in their other indications of quality as evidenced in the ribeye muscle. Carcasses within the full range of maturity classified as beef are included in the Cutter grade. Thus, five maturity groups are recognized. Minimum quality requirements are described for three of these groups—the first or youngest, the third or intermediate, and the fifth or the most mature. The requirements for the second and fourth maturity groups are determined by interpolation between the requirements described for their adjoining groups.

(2) Carcasses in the first or youngest maturity group range from the youngest that are eligible for the beef class to those at the juncture of the first two maturity groups, which have slightly red and slightly soft chine bones and cartilages on the ends of the thoracic vertebrae that have some evidence of ossification. In addition, the sacral vertebrae are completely fused and the cartilages on the ends of the lumbar vertebrae are nearly completely ossified. The rib bones are slightly wide and slightly flat and the ribeye muscle is slightly dark red in color and fine in texture. In carcasses throughout the range of maturity included in this group, the ribeye muscle is devoid of marbling and may be very soft and watery.

(3) Carcasses in the third or intermediate maturity group range from those with indications of maturity barely more advanced than described as maximum for the Standard grade to those with moderately hard, rather white chine bones and with cartilages on the ends of the thoracic vertebrae that show considerable ossification but the outlines of the cartilages are still plainly visible. In addition, the rib bones are moderately wide and flat and the ribeye muscle is dark red in color and slightly coarse in texture. In carcasses throughout the range of maturity included in this group, the ribeye muscle is devoid of marbling and may be soft and watery.

(4) Carcasses in the fifth or oldest maturity group have hard white chine bones and the outlines of the cartilages on the ends of the thoracic vertebrae are barely visible, the rib bones are wide and flat, and the ribeye muscle is very dark red in color and coarse in texture. The range in maturity in this group extends to include carcasses from the oldest animals produced. The minimum degree of marbling required increases with advancing maturity throughout this group from minimum practically devoid to maximum practically devoid (see Figure 1) and the ribeye muscle is soft and slightly watery.

(h) Canner. The Canner grade includes only those carcasses that are inferior to the minimum requirements specified for the Cutter grade.