## Abstract

This study was planned to relate two different-type equations analyzing the increase in dry matter indigestibility (IDMI) in the growth of forages. The following equation showed the relationship between two equations, namely, the the left-hand side equation by Masuda (1985) and the right-hand side equation which was a changed form of the original equation by Shimojo et al. (1995). I_{1}/W_{1} · [exp {(RGR_{i} - RGR_{w}) · (t_{2} - t_{1})} - 1] = (1 - W_{1}/W_{2}) · (SFR/RGR_{w} · D/W - I_{1}/W_{1}), where W = forage dry weight (W_{1} ≠ W_{2}), I = dry weight of indigestible materials, D = dry weight of digestible materials (D_{1} ≠ D_{2}), RGR_{w} = mean relative growth rate of forage, RGR_{i} = mean relative growth rate of I, (1 - W_{1}/W_{2}) = forage growth index [FG index], SFR = mean specific formation rate of I per unit D, D/W = the ratio of D to W [D ratio], {(SFR/RGR_{w}) · (D/W) -I_{1}/W_{1}} = a changed form of DMP index (DMP index: index for dry matter partition into I). The following results were obtained: RGR_{i} was found to be related to SFR from their positions in the equation, and this might support the suggestion by Masuda (1985) about the close relation of RGR_{i} to SFR. SFR might substantially relate the equation by Masuda (1985) and the equation by Shimojo et al. (1995). It was suggested that there was a close relationship between two different-type equations analyzing the increase in dry matter indigestibility with growth of forages.

Original language | English |
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Pages (from-to) | 361-364 |

Number of pages | 4 |

Journal | Journal of the Faculty of Agriculture, Kyushu University |

Volume | 42 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - Mar 1998 |

## All Science Journal Classification (ASJC) codes

- Agronomy and Crop Science
- Biotechnology