平衡致死法による実用的な雄蚕飼育技術の確立

抄録

A balanced sex-limited lethal (BL) strain was bred from the sex-limited Moricaud for the purpose of setting up a male-raising system, since males excel against females in the silk manufacturing efficiency and cocoon quality. This BL strain was backcrossed using the W7 strain (Chinese race) with good economical characters, reconstructed to recover the balanced lethality and selected for the economical characters comparable to the level of W7 strain. Then, males of thus improved BL strain were crossed with females of a Japanese race to prepare a hybrid, which was committed to the rearing test in a farmhouse. The hybrid exhibited, in the summer rearing season of 2004, remarkable records in terms of cocoon shell percentage, cocoon shell weight, cocoon filament length and so on. On the basis of these results, we concluded that a new BL strain was established and named this “PLATINA BOY.”