Abstract
Eri silkworm (Samia ricini Boisd.) is a commercially exploited domesticated silkworm. In the present study an effort was made to evaluate the rearing performances of five eco-races of eri silkworm such as Borduar, Titabar, Dhemaji, Diphu and Kokrajhar in the circumstances of Jorhat district of Assam. The main objective behind this study was to find out the best performing eri silkworm eco-race for the Jorhat district to increase the income of the eri silkworm rearers of the region. To study each of the parameter for evaluating the rearing performances of the eco-races, the larvae were selected randomly from each of the three replication that were maintained separately for the eco-races by using Completely Randomized Design (CRD). The analysis was based on different larval and cocoon characters like larval weight (g), cocoon weight (g), shell weight (g), pupal weight(g), shell ratio (%), effective rate of rearing (ERR%). Out of these five eco-races of eri silkworm Titabar eco-race showed better performance followed by Borduar and Dhemaji in terms of all the aspects. The larval and cocoon parameters were found to be significantly different for each of the eco-race of eri silkworm.
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