Relative Feed Value (RFV) of Forages

The term Relative Feed Value (RFV) is becoming a widely-used index of quality in the marketing of hay, especially alfalfa hay. Protein is an important factor, some hays can have a relatively high protein but for a variety of reasons they may have relatively high fiber and low digestibility at the same time. On the other hand, it is unusual for hay with a low level of fiber to have low protein as well. The overall value is best indicated by fiber levels.