HETEROSIS EXPRESSION AND F1 INHERITANCE OF BIOLOGICAL CHARACTERS IN SILKWORM BOMBYX MORI L. SEX – LIMITED FOR LARVAL MARKING BREEDS | ХЕТЕРОЗИСЕН ЕФЕКТ И УНАСЛЕДЯВАНЕ В F1 НА БИОЛОГИЧНИ ПРИЗНАЦИ ПРИ ПОРОДИ И ХИБРИДИ НА КОПРИНЕНАТА ПЕПЕРУДА - BOMBYX MORI L., МАРКИРАНИ ПО ПОЛ НА СТАДИИ ЛАРВА
2013
Arkova-Pantaleeva, D., Sericulture and Agriculture Experimental Station, Vratza (Bulgaria) | Tsenov, P., Sericulture and Agriculture Experimental Station, Vratza (Bulgaria) | Vasileva, Y., Sericulture and Agriculture Experimental Station, Vratza (Bulgaria)
A study of hybrids, obtained from four silkworm sex-limited for larval markings breeds - Vratsa 2003, Vratsa 2006, Vratsa 2007 and Vratsa 2012 and two ordinary breeds - Vratsa 54 and Vratsa 55 has been carried out. It was found out that the hybrid Vratsa 2007 x Vratsa 2012 was the best – having high pupation rate and its reciprocal cross Vratsa 2012 x Vratsa 2007 was characterized with the highest egg hatchability. The hybrids Vratsa 2003 x Vratsa 54, Vratsa 2006 x Vratsa 2003 and Vratsa 2006 x Vratsa 55 manifested a fresh cocoon yield by a box of eggs over 40 kg. The hybrids tested exhibited a positive heterosis in F1 for the characters pupation rate and fresh cocoon yield by a box of eggs, compared both to the mid and higher-parent values /MP and HP/. The inheritance in F1 of the characters pupation rate and fresh cocoon yield by a box of eggs is of the type of positive overdominance.
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