What is the difference between hibernqting and non-hibernating egg?
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The artificial hibernation and the treatment with hydrochloric acid after refrigeration of the bivoltine silkworm eggs, Bombyx mori were compared to evaluate the quality and productivity of cocoons in the tropical conditions, where both types of silkworm eggs are available all the year round. In this experiment six crosses of hybrids were evaluated in two rearing seasons in the year 1998 and 1999, and the results of commercial cocoon production during 1997 and 1998 in the agricultural farms of two sericultural zones in Colombia were analysed to compare two types of treatment of the silkworm eggs. No significant difference was presented between the artificial hibernation and the acid treatment in the economic characters, such as the larval duration, the percentage of reelable cocoons and pupation rate. However, the hibernated eggs showed a higher weight of single cocoon and cocoon shell than those treated with hydrochloric acid. This indicates that the artificial hibernation of silkworm eggs will improve the quality of commercial cocoons in the tropical conditions, without affecting the other characters. It can be concluded that the non-hibernating eggs caused by the treatment of hydrochloric acid produce cocoons with lower silk layer than the hibernated ones, even though the negative does not reach the cocoons produced by silkworms which lay non-hibernating eggs naturally