乳牛の泌乳曲線に関する２種の数学モデルの比較
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概要
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Data of 44 lactations for Holstein cows sampled weekly in 8 prefecture experimental farms were used to compare two models of the lactation curves: the Wood model of y = a t<SUP>b</SUP> e<SUP>-ct</SUP> and the McMillan model of y = d (1—e<SUP>-g (t-h)</SUP> ) e<SUP>-ft</SUP> (t>h). The mathematical models of Wood and McMillan were fitted to the results for individual cows by a non-linear least square method. The results obtained were summarized as follows:<BR>(1) The standard deviations for all parameters of the Wood model were less than those of the McMillan model.<BR>(2) The McMillan model fitted the data better than the Wood model except four cows with respect to AIC (Akaike's Information Criterion).<BR>(3) Highly significant correlations were found between several parameters of the Wood model and the McMillan model: a, b, c of th Wood model and d of the McMillan model, c of the Wood model and f of the McMillan model, and, b, c of the Wood model and g of the McMillan model.
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