Accumulation Rate of Digestible Materials and Formation Rate of Indigestible Materials in the Description of Relative Growth Rate of Forages

This study was conducted to clarify the interrelationships between some analytic equations for the accumulation rate of digestible materials [ARD] and the interrelationships between those for the formation rate of indigestible materials [FRI], followed by the description of forage relative growth rate [RGR] using ARD and FRI. The following results were obtained: There were two equations to analyze ARD and one equation was a modified type of the other equation. Four equations were set up to analyze FRI and the prototype one was modified to change into the fourth equation which might describe the target materials of lignification more clearly than the other three equations. Forage RGR was described using ARD and FRI and this might give another interpretation of RGR based on the utilization characteristics of forages. It was suggested that there were some equations to analyze ARD and FRI describing RGR of forages.