Which of the following is not a grade of beef?

In the grading of beef, the primary classifications recognized by the USDA are Prime, Choice, and Standard. These grades reflect the meat's quality based on factors such as marbling, tenderness, and overall texture, which are indicators of the eating experience.

Prime beef is the highest grade, known for exceptional tenderness and marbling, making it the preferred choice for high-end restaurants and fine dining. Choice beef is slightly lower in quality but still offers great flavor and tenderness, making it widely available in supermarkets. Standard beef usually has less marbling and is typically less expensive, appealing to consumers looking for value in their meat purchases.

The classification "Heavy" does not exist as an official grade within the USDA beef grading system. Therefore, it is not recognized as a grade of beef, making it the correct answer to the question. Understanding this classification system is vital for anyone involved in agriculture, food production, or culinary arts, as it influences consumer choices and pricing in the market.