## Abstract

This study was conducted to present a new equation for analyzing the decrease in dry matter digestibility [DDMD] with growth of forage, and to relate it and the previous equation analyzing DDMD (Shimojo et al., 1998b). The following equation showed the relationship between two equations, namely, the new equation on the left-hand side and the changed form of the previous equation on the right-hand side. D_{1}/W_{1} · [1 - exp {(RGR_{d} - RGR_{w}) · (t_{2} - t_{1})}] = (1 - W_{1}/W_{2}) · (D_{1}/W_{1} - RGR_{d}/RGR_{w} · D/W), (A) where W = dry weight of forage (W_{1} ≠ W_{2}), D = dry weight of digestible materials (D_{1} ≠ D_{2}), RGR_{w} = mean relative growth rate of forage, RGR_{d} = mean relative growth rate of D, (1 - W_{1}/W_{2}) = forage growth index [FG index], {D_{1}/W_{1} - (RGR_{d}/RGR_{w}) · (D/W)} = a changed form of DDMPD index (DDMPD index: index for the decrease in dry matter partition into D). The following results were obtained: Equation (A) showed that DDMD was expressed using RGR_{d} and RGR_{w} as main factors in either of two different-type equations. It was suggested that there was a new equation analyzing DDMD, and using the new and previous equations some information was obtained for the change in dry matter digestibility with growth of forages.

Original language | English |
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Pages (from-to) | 373-376 |

Number of pages | 4 |

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

Volume | 42 |

Issue number | 3-4 |

Publication status | Published - Mar 1 1998 |

## All Science Journal Classification (ASJC) codes

- Biotechnology
- Agronomy and Crop Science