9 C.F.R. § 381.156
Poultry meat content standards for certain poultry products.
Poultry products with labeling terminology as set forth in Table I shall comply with the specifications for percent light meat and percent dark meat set forth in said table.
Table I; Label terminology | Percent light meat | Percent dark meat; Natural proportions | 50-65 | 50-35.; Light or white meat | 100 | 0.; Dark meat | 0 | 100.; Light and dark meat | 51-65 | 49-35.; Dark and light meat | 35-49 | 65-51.; Mostly white meat | 66 or more | 34 or less.; Mostly dark meat | 34 or less | 66 or more.
[37 FR 9706, May 16, 1972, as amended at 39 FR 4569, Feb. 5, 1974]