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Nutritive effects of d-amino acids on the silkworm, Bombyx mori
Authors:Toshio Ito  Tamio Inokuchi
Affiliation:Sericultural Experiment Station, Yatabe, Tsukuba, Ibaraki 305, Japan
Abstract:Nutritive effects of d-amino acids on the silkworm, Bombyx mori, were investigated by growth experiments using defined diets and also by analysis of free amino acids in the larval haemolymph. None of the d-forms of the usual ten essential amino acids could be utilized effectively, although d-methionine was utilized in lieu of the l-form only to a limited extent and d-histidine gave a positive but smaller effect than d-methionine. d-Proline, its l-form being semi-essential for the silkworm, was not utilized. d-Leucine, and to a lesser extent d-alanine and d-serine, were found to be somewhat toxic. Comparison of free amino acid patterns in the haemolymph of the fifth-instar larvae, which fed on diets either lacking l-forms of histidine, methionine and leucine singly or including the d-forms singly in place of these l-forms, supported the results of the growth experiments.
Keywords:Silkworm  nutrition  haemolymph amino acids
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