Studies on the factors determining the quality of silage:The relations between the pH value and various factors(1)

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• Analyzing the data obtained from the ensilage made in different districts of Japan, the author investigated into factors determining the quality of ensilage and described the relationship between the pH value and organic acid content, between the pH value and dry matter content and between the pH value and the loss of nutrients during the ensilaging. The results obtained are summarized as follows: 1. Contained in a considerable number of samples with butyric acid was pH below 4.0. On the contrary, it was not contained in some samples with pH above 4.0. It was found that the pH value was the most important, if not the exclusive, criterion of quality, and 2. that sensuous factors, such as color and odor, were the auxiliary criteria. Significant negative correlations were found between the pH value and the hue, and between the pH value and the luminosity of the extract of ensilage. 3. The lactic acid content of green maize ensilage was significantly larger than that of sweetpotat ovine ensilage. 4. Remarkable negative correlations were found between the pH value and lactic acid content, and between the pH value and the ratio of lactic acid content to the total acid. 5. Moreover, significant positive correlations were found between the pH value and butyric acid content, and between the pH value and the ratio of butyric acid content to the total acid. There was asignificant correlation between the lactic acid content and butyric acid content. On the other hand, a significant correlation was found between the pH value and the totol acid.6. Significant negative correlations were found between the pH value and the loss of crude protein, during the storage of ensilage and between lactic acid content and the loss of crude protein during the storage. 7. The correlation between the pH value and the density of ensilage as a mass was significantly positive within the range of specific gravity from 0.80to 1.10. 8. A negative correlation, r=-0.304, was found between the pH value and the dry matter content of ensilage. Furthermore, the author's attention will be directed toward the determination of other factors which may have some relations to the quality of ensilage.

• 公益社団法人 日本畜産学会の論文

公益社団法人 日本畜産学会 | 論文

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