Characteristic of newly created F1 tetrahybrids of the silkworm Bombyx mori L. reared with artificial diet: Basic technological traits

Radostina Guncheva1, Panomir Tsenov2 and Yolanda Vasileva2

1 Trakiа University, Faculty of Agriculture, Department of Animal Science – Non-ruminants and other Animals, 6000 Stara Zagora, Bulgaria
2Scientific Center on Sericulture, 3000 Vratsa, Bulgaria

Guncheva, R., Tsenov, P. & Vasileva, Y. (2020) Characteristic of newly created F1 tetrahybrids of the silkworm Bombyx mori L. reared with artificial diet: Basic technological traits. Bulg. J. Agric. Sci., 26 (Suppl. 1), 126-132

The aim of this paper was characteristic of newly created F1 tetrahybrids of the silkworm Bombyx mori L. reared with artificial diet throughout the entire larval stage on basic technological traits, which are essential for determining the productivity of silkworms. The study was conducted during 2018 – 2019 at the Training Experimental Station of the Sericulture section of the Faculty of Agriculture at Trakia University. Object of the study were the tetrahybrid forms of the silkworm (Bombyx mori L.) "Vraca63 x Line22 / Nig2 x Merefa6" (1st experimental group) and "Nig2 x Merefa6 / Vratsa63 x Line22" (2nd experimental group). The new, but already established in practice tetrahybrid "I1 x VB1 / N2 x HB2" was used for the control group. The necessary silkworm eggs for the present study were obtained and stored until the moment of their incubation by the method of Early wintering (Tsenov et al., 2009). Silkworms were reared with artificial diet containing 30% powder of dried mulberry leaf produced at Scientific Center on Sericulture – Vratsa and prepared by methods, developed by the manufacturer. The comparative analysis of hybrids from the two experimental group show that with a greater total (837.17 m) and continuous unwinding (816.20 m) length, finesse (2.46 danier) and better unwinding (87.70%) of the thread, as well as with higher silkiness (44.98%) and yield (39.49%) of the cocoons is characterized the tetrahybrid form "Nig2 x Merefa6 / Vratsa63 x Line22". The analyzed hybrids are characterized by high mean values ​​on the traits determining the quality of their production, which gives reason to believe that the newly created F1 hybrids have relatively high levels of technological traits when rearing throughout the larval development with artificial diet.

Keywords: silkworms; Bombyx mori L.; hybrids; artificial diet; cocoons; productivity; technological traits

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