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ThesisItem Open Access Effect of mating duration on reproductive parameters and its impact on larval growth and quality of cocoons of eri silkworm, Samia ricini Donovan(AAU, Jorhat, 2018) Teronpi, Leedarin; Saikia, MonimalaThe current investigation on effect of mating duration on reproductive parameters and its impact on larval growth and quality of cocoons of eri silkworm, Samia ricinia Donovan, was carried out in the laboratory of Department of Sericulture, Assam Agricultural University, Jorhat in autumn and spring season during the year 2017-2018. The findings revealed that mating duration had significant effect on fecundity/ female/ day, total fecundity, weight of eggs, total weight of eggs and average hatchability percentage and non-significant effect on total oviposition duration and incubation period of eri silk moth. In almost all mating durations and seasons the egg laying percentage was maximum in the first day which gradually decreased with succeeding number of ovipositing days. Irrespective of season, five hours of mating duration was found to be better in total fecundity, weight of eggs and total weight of eggs which was at par with four hours mating duration. Four hours of mating duration was found to be better in both fecundity/ female/ day and average hatchability percentage regardless of season. Season also had significant effect on total oviposition duration, fecundity/ female/ day, total fecundity, weight of eggs, incubation period and average hatchability percentage. Total oviposition duration and incubation period of eri silk moth was recorded longer in spring season than autumn season. Fecundity/ female/ day, total fecundity and weight of eggs of eri silk moth were recorded better in autumn season. But, average hatchability percentage was better in spring season. Mating duration had no significant effect on larval growth and cocoon parameters. However, season had significant effect on larval duration, weight of full grown larvae, weight of matured larvae, ERR (%), cocoon weight, shell weight and pupal weight. Larval duration of eri silk moth was recorded shorter in autumn than spring season. Weight of full grown larvae, weight of matured larvae, ERR (%), cocoon weight, shell weight and pupal weight of eri silk moth was recorded better in autumn season than spring season. But, shell ratio (%) was better in spring season. Interaction effect between mating duration and season was significant in total oviposition duration, weight of eggs/ female/ day, larval duration, cocoon weight and pupal weight. Thus, from the present investigation it may be inferred that a period of three to five hours coupling duration is optimum for maximum egg laying of eri silk moth. In addition to this, though the fecundity and weight of eggs was registered better in autumn, with shorter incubation period and hatching percentage of eggs of the silk moth performed better in spring season. Larval and cocoon parameters showed better performance in the autumn season than spring season.