Estimation of Growth Pattern of Body Weight in Foal, <I>Thoroughbred</I> Using of Richards Growth Model with Three Point Method

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  • 子馬 (サラブレッド種) の体重に基づく成長パターンの3点法を用いたRichards Growth Modelによる推定

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The growth pattern of body weight in foal, Thoroughred from 30 to 50 days olds was estimated by the data classfied with sexes and parities using of the Richards growth model, the three point method was also applied to the estimation of growth pattern of foal. Each data was extracted independently from each three developmental stage, such as initial, middle and final one, respectively. These three point of data was compared between each age of six groups. Shape parameter“m”in the Richards growth model was applied from 0.0 to 2.0 in scale of 0.1.<BR>1) The growth pattern of foal, thoroughbred may be estimated with 98%/ or greater of coefficient of determination R2 by the body weight data in both of sexes and parities.<BR>2) The shape parameter“m”at the highest R2 point was presented at 0.0 and growth curve has no inflectional point in the present analysis.<BR>3) The body weight at 5-6 parities were the largest in all ages. The parity may be in reverse ratio to the average of body weight.

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