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Sericultural & Apicultural Materials Division, National Academy of Agricultural Science, RDA, Suwon 441-100, Republic ofKorea(Received 10 October 2011; Accepted 20 February 2012)The effect of cultivation season on the cocoon filamentquality of authorized silkworm variety, GoldenSilk wasexamined with cocoon filament character, reeling char-acter, and fiber character during 3 years. In cocoon fil-ament character, filament length of spring and autumncocoon was 979 and 879 m, respectively. Cocoon fila-ment weight of spring and autumn cocoon was 33.1 and26.5 cg, which is lower than that of general bivoltinestrain, BaeGokJam. Raw silk percentage of spring andautumn cocoon was 15.65 and 13.77%, respectively. Inreeling character, reelability showed similar trendregardless of cultivation season and strain. However, thelength and weight of non-broken filament of spring sea-son were slightly higher than those of autumn cocoon.Cultivation season did not affect on the fiber charac-teristics such as clearness and neatness, lousiness, anddegumming loss. In cocoon character, filament length,size, and weight, spring cocoon filament showed highervalue than autumn cocoon, but lower than authorizedgeneral silkworm varieties. In reeling characteristics,non-broken length and weight showed the similartrends with the cocoon filament character. However, thereelability of GoldenSilk cocoon was not affected by cul-tivation season. The reelability of GoldenSilk cocoonwas also similar with that of authorized general one.Fiber character including clearness and neatness, lous-iness, and degumming loss was also similar regardlessof the rearing season and different strain. Key words: Cocoon filament quality, Cultivation season,Cocoon filament, Reeling

Cocoon Filament Quality of a Special Silkworm Variety, GoldenSilk