甘草廃棄物の飼料化に関する基礎的研究

甘草根から有効成分であるグリシルリチンを分離,精製する際に大量に発生する甘草粕と精製粕の飼料化について検討した。

体重約20kgのザーネン種去勢山羊を用いた消化試験から,乾燥甘草粕の栄養価は,TDN 38.2%, DCP 0.7%, NR 53.7であり,乾燥精製粕の栄養価はTDN 42.0%, DCP 28.5%, NR 0.47であった。

生の甘草粕をブリキ製のドラム罐に夏季150日間埋蔵すると甘草特有の悪臭も消え家畜の嗜好性もます。ふすまなどの適切な材料を配合すればpHも下り,乳酸含量もまして良好なサイレージを作りうる可能性のあることが示唆された。

The process of separating and purifying Glycyrrhizin, a medical ingredient, from the Kanzo (Glycyrrhiza globra Linné) roots produces large amounts of wastes. Faced with the problem of disposal of these wastes in the environment, we intended to find a use for them as animal feed. Two kinds of Kanzo wastes occur in the different steps, Pulp and Cake.

The digestion trials by goats (BW ca 20Kg) showed that the nutritive values of the dried Pulp are 38.2% of TDN, 0.7% of DCP and 53.7 of NR, and those of the dried Cake are 42.0% of TDN, 28.5% of DCP and 0.47 of NR.

Ensiled for 150 days in summer, the wet wastes could be preserved without any putrefaction. The offensive odor, peculiar to the wet Kanzo wastes, disappeared and the produced silage odor enhanced the palatability of the wastes for the animals. It was found out too that addition of appropriate stuffs, such as wheat bran, can make it still a better silage for animals.