Studies on the Evaluation of Dry Matter Content and Feeding Value in Silage : VI. Estimation and application of toluene distillation method, freeze drying method and gas chromatography for moisture determination

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  • サイレージの乾物含量並びに飼料価値の評価に関する研究 : VI.水分定量のためのトルエン蒸留法,凍結乾燥法及びガスクロマトグラフィーの評価と応用
  • サイレージの乾物含量並びに飼料価値の評価に関する研究-6-水分定量のためのトルエン蒸留法,凍結乾燥法及びガスクロマトグラフィーの評価と応用
  • サイレージ ノ カンブツ ガンリョウ ナラビニ シリョウ カチ ノ ヒョウカ

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In order to estimate the effectiveness of some improved methods for accurate determination of moisture (dry matter) in silage, the quantities of moisture in fresh herbage and silage were determined by: acid-corrected toluene distillation (TD); freeze drying at -50℃ under pressure of less than 0.005mm Hg for 24h (FD); gas chromatography according to BURDICK and McHan (GC); and by oven drying (OD) as a control. Moisture contents of fresh herbage and resultied silage samples of alfalfa (Medicago sativa L.) and Italian ryegrass (Lolium multiflorum LAM.) were analyzed in five replicates by OD, TD, FD and GC, respectively. All the samples had highest values in OD and lowest values in GC for moisture contents. There was considerable difference in moisture content of the silage among the analytical methods, but no marked difference in moisture level of the fresh herbages was found among the methods. In addition, significant differences between TD and FD were not detected in moisture content of all the samples. Analytical samples. 26 silages (IS) made from Italian ryegrass and 36 silages (CS) made from corn (Zea mays L.), were collected from 62 farms and subjected to the measurement of chemical composition and moisture content. Quality scores estimated by FLIEG's method of IS and CS samples were 67.8±25.6 and 89.3±17.3, respectively. At the same time, moisture contents determined by OD, FD and GC were: 62.84±10.14, 59.83±10.74 and 58.28±9.93(%) in IS samples; 67.40±6.16, 65.95±6.29 and 64.03±6.73(%) in CS samples, respectively. There were significant differences (p<0.01) in moisture content of these silage samples between the analytical methods. On the other hand, coefficients of significantly (p<0.001) positive correlation and equations for the linear regression were detected between OD and FD or GC for moisture content of the silage samples. The result suggests that the application of these improved techniques is effective for the accurate determination of moisture in silage.

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