Which forage crop would produce hay with the highest protein content if cut at the optimum time?

Alfalfa is known for producing hay with a high protein content, especially when harvested at the optimum time. This leguminous forage is rich in protein due to its ability to fix nitrogen from the atmosphere, which contributes to its nutritional value. When cut at the right stage of maturity, alfalfa can contain protein levels ranging from 15% to over 25%, making it one of the most desirable forages for livestock feeding.

In contrast, the other options, such as native range, smooth bromegrass, and tall fescue, generally have lower protein levels. Native range grasses can vary widely in their nutritional quality, often being mixed species that approximate lower protein values. Smooth bromegrass and tall fescue may produce good forage but typically do not reach the protein levels characteristic of alfalfa, especially when not managed for peak quality. Therefore, for those aiming to achieve optimal protein content in hay, alfalfa stands out as the superior choice.