Two different-type equations of relative growth analysis for both forages and ruminants and deriving of them from a hypothetic equation

Two different-type equations of relative growth rate [RGR] for both forages and ruminants were taken up in the present study. Four equations of RGR ea ch were composed of three or more components, and some features of them wer e summarized as follows: (1) forage RGR related to production analysis, (2) forage RGR related to utilization analysis, (3) ruminant RGR related to me tabolic body size, and (4) ruminant RGR related to leed digestibility. Thre e of them, namely equations (2), (3) and (4) were discussed with data. Then , four equations were derived, as special cases, from a hypothetic equation for RGR suggested in the present study. This hypothetic equation was reduc ed to that suggested previously (Shimojo ct al., 1998a, b) from which RGR e quation with two components for forages and that fbr ruminants had been der ived as special cases.