Optimum forage quality is critical with grain, commodity and forage prices at historic highs. Relative feed value (RFV) was a ranking tool useful in the past. It incorporates ADF and NDF to estimate intake and digestion.

Relative forage quality (RFQ) is of greater utility to value hay crop forages today. It incorporates additional nutrient analyses including a measure of vitro digestibility. Fiber digestibility differs within a forage species, largely related to the amount of lignin in the neutral detergent fiber (NDF).

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