Identifying potent and stable silkworm (Bombyx mori L.) genotypes among the large population at early stages of development is one of the primary problems in silkworm breeding. For families with resilience to develop under stressful conditions in the embryonic period, the presented experiments transpired to identify the outstanding families during incubation at the highest temperature. During the wintering period of eggs, a sample of 100 eggs came from each breeding family. These 100 eggs sustained incubation at the temperature of +34 °C. In almost every line, the traits recorded for provocative and average incubation, and the viability of the larvae fully corresponded to each other. Breeding families with different characteristics underwent three grades’ division regarding egg livability at critical temperatures. The gradations contained families with high, medium, and low livability. Families performed well during provocative. Meanwhile, identification and selection also ensued under standard incubation conditions. Based on preliminary results, the families exhibited the varied response rate to stressful conditions during the embryo period. However, the families with resistance to high temperatures showed the maximum viability potential during the larvae feeding. In particular, L-31 (59.6%) and L-300 (51.4%) lines gave the highest viability rates, and using these lines have served to conduct additional studies. A plan of experiments is in progress for the future to improve these lines to the breeding level. Developing a dietary plan to feed individuals living in warm climates is ongoing, with much care given in a challenging environment.
Silkworm (B. mori L.), eggs, incubation, larvae, viability, cocoon, shell ratio, heat shock
The research involving incubation at a high temperature, newly developed lines of the mulberry silkworm (B. mori L.) and the selection of families with high vitality have practical implications. The latest results will enhance the theoretical understanding of sericulture and inspire practical applications, improving the quality and productivity of silk production.