Final answer:
The USDA grades of beef missing from the list are Cutter and Standard. These grades help judge the quality of the beef influenced by factors such as diet, with grass-fed beef often being more desirable to consumers.
Step-by-step explanation:
The USDA grades of beef missing from the provided list are Cutter and Standard. The USDA beef grades in ascending order of quality are Canner, Cutter, Utility, Commercial, Standard, Select, Choice, and Prime. The grades assess factors such as marbling, tenderness, flavor, and overall quality, which are influenced by the diet and management of the cattle during their growth. Grass-fed beef, preferred by some for its taste and health benefits, can command higher prices in the market.