Evaluation of Error of Digestibility with Cattle

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  • ウシの消化率に伴う誤差の大きさと2,3の性質
  • ウシ ノ ショウカリツ ニ トモナウ ゴサ ノ オオキサ ト 2 3 ノ セイ

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The property and magnitude of experimental error of digestibility is one of the most important factors in planning an experiment, considering and applying the results of experiment to the technical systems. In this paper, some of properties and magnitude of the error variance of digestibility were estimated and discussed. The magnitude of the error of digestibility decreased theoretically in proportion to the value of digestibility increased. However, the measured error variance can be considered as constant in the range of practical digestibility. The error variance of digestibility can be divided into two important portions-error due to biological variation among individual cattle (σ2p) and error due to chemical analysis of feces (σ2a)-by the hierarchal classifications. The magnitude of σ2p was ten times as large as σ2a. It suggested that in order to measure the digestibility with high accuracy, it is more effective to increase the number of cattle used than to increase the repeability of chemical analysis of feces. Considering the cost of experiment, however, it may be economical to measure the chemical components in feces with high accuracy. The magnitude of σ2p with cattle was almost equal to σ2p with sheep or chicks. The error of TDN/DM (%) was almost equal to the error of digestibility of DM or OM.It can be given explanation theoretically by the equation to be used in calculation of TDN and NFE. In other wards, TDN can be calculated numerically from the value of digestible organic matter and digestible ether extract or from the value of digestible dry matter, digestible ether extract and digestible crude ash, Confident interval at 95% level of digestibility (%), DCP/DM (%), TDN/DM (%) and DE/DM (Mca1/kg) measured using "N" cattle per ration were computed from the error variances. The error of digestibility of ration ingredient itself, not of the whole ration, shows a value "k" times that of the whole ration. The constant "k" was calculated by the content of ingredient in whole ration.

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