準合成飼料による家蚕の全齢飼育について

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Three different semi-synthetic (meridic) diets not containing leaf powder, the Starter (for 1st-instar larvae of the silkworm), the Grower (for 2nd- to 4th-instar larvae), and the Producer (for 5th-instar larvae), were newly formulated based on the previous information on nutrition and dietetics of the silkworm. The emphasis was put on the acceleration of feeding of the diet in the formulation of the Starter, and on the acceleration of growth of larvae in the formulation of the Producer (Table I). Rearing of larvae was carried out in a small scale at the 6 different rearing places, starting with each 200 larvae of the hybrid strain, N124×C124, in autumn of 1968. The larval mortality was low, the larval growth was conspicuous (Table II), and some of the full-grown 5th-instar larvae exceeded 9g of live weight, which is hardly attainable with fresh mulberry leaves. Cocoon weight was heavier than those previously reported for the rearing on semi-synthetic diets, but the cocoon-shell ratio was lower than those of the ordinary cocoons, because of a relatively lower production of cocoon-shell itself (Table III). The length of the 5th-instar period was relatively shortened, and this is considered to be a main cause of the relative decrease in the cocoon-shell weight in the rearing, on semi-synthetic diets. Some of the larvae were unable to shed off the old cuticle normally at pupation or became larval-pupal intermediates, although they spun cocoons normally. In this connection, a brief discussion was made as to the composition of the semi-synthetic diet.
社団法人日本農芸化学会の論文

準合成飼料による家蚕の全齢飼育について

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