Selection of Silkworm Breeds without Pigmentation of the Egg Serosa Shell I. Biological Characters
Keywords:
silkworm, Bombyx mori L., breeding, egg, serosa, colorAbstract
At the Scientific Center on Sericulture, Vratsa a study on selection of silkworm breeds without any
pigmentation of the egg serosa shell, which may be further used for highly productive sex-limited for
egg color silkworm breeds creation has been conducted during the period 2011–2018. As a result of
the breeding work conducted two highly productive breeds without any pigmentation of the egg serosa
shell, but manifesting high biological characters values – Milena 1 of the Japanese type and Milena 2
of the Chinese type were created. The two newly created silkworm breeds displayed a productivity,
not lower than the ordinary highly productive silkworm breeds having colored egg serosa.
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