# A Hypothetic Equation from Which Growth Analysis Equations of Forages and Ruminants are Derived as Special Cases

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

## Abstract

This study was conducted to suggest a hypothetic equation from which absolute growth rate [AGR] and relative growth rate [RGR] of forages and those of ruminants were derived as special cases. The following equation was suggested: H 0 = (1/α · dβ/dt) · (α/γ) · (dW/dβ), where α, β and γ are parameters related to AGR of forages [AGRr], AGR of ruminants [AGRf], RGR of forages [RGRf] or RGR of ruminants [RGRr], W denotes dry weight per plant or body weight per animal. Substituting an appropriate term from the four terms (1, A, F and W) for each of α, β and γ gave the following six equations: AGR=dW/dt, RGR=(1/W)·(dW/dt), AGRf={(1/A)·(dW/dt)}·(A), RGRf={(1/A)·(dW/dt)}·(A/W), AGRr=(dF/dt)·(dW/dF), RGRr={(1/W)·(dF/dt)}·(dW/dF), where A=leaf area, (1/A)·(dW/dt)=net assimilation rate, A/W=leaf area ratio, F=cumulative feed intake, dF/dt=feed ingestion rate, dW/dF=feed efficiency, (1/W)·(dF/dt)=feed ingestion rate per unit W. In this study a hypothetic equation was suggested to the derivation of growth analysis equations of forages and ruminants as special cases.

Original language English 103-109 7 Journal of the Faculty of Agriculture, Kyushu University 43 1-2 Published - Nov 1998

## All Science Journal Classification (ASJC) codes

• Biotechnology
• Agronomy and Crop Science

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