Two Different-Type Equations Analyzing Decrease in Dry Matter Digestibility with Growth of Forages

Masataka Shimojo, Takashi Bungo, Yoshimi Imura, Manabu Tobisa, Naoki Koga, Shao Tao, Muhammad Yunus, Zhao Yin, Yutaka Nakano, Ichiro Goto, Yasuhisa Masuda

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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. D1/W1 · [1 - exp {(RGRd - RGRw) · (t2 - t1)}] = (1 - W1/W2) · (D1/W1 - RGRd/RGRw · D/W), (A) where W = dry weight of forage (W1 ≠ W2), D = dry weight of digestible materials (D1 ≠ D2), RGRw = mean relative growth rate of forage, RGRd = mean relative growth rate of D, (1 - W1/W2) = forage growth index [FG index], {D1/W1 - (RGRd/RGRw) · (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 RGRd and RGRw 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 languageEnglish
Pages (from-to)373-376
Number of pages4
JournalJournal of the Faculty of Agriculture, Kyushu University
Volume42
Issue number3-4
Publication statusPublished - Mar 1 1998

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science

Cite this

Shimojo, M., Bungo, T., Imura, Y., Tobisa, M., Koga, N., Tao, S., ... Masuda, Y. (1998). Two Different-Type Equations Analyzing Decrease in Dry Matter Digestibility with Growth of Forages. Journal of the Faculty of Agriculture, Kyushu University, 42(3-4), 373-376.