Quality Assessment of Cocoon Filament Produced by Bivoltine Silkworm Hybrids

Abstract

Quality assessment of the cocoon filament produced by the bivoltine silkworm hybrids which diallel crossed among PH2, PH3, PH5, PH8, PH9, and PH10 were performed. The 30 selected silkworm hybrids were assigned in the randomized complete block design with 10 replications. Three continued experiments were conducted at Chiang Mai Sericultural Experiment Station in three periods: August 1996, November 1996 and March 1997. The results indicated that 5 hybrids: PH5 x PH9, PH 8 x PH5, PH8 x PH10, PH9 x PH5 and PH9 x PH8 produced better silk qualities regarding to thread lengths and sizes of the cocoon filament, and thread suitability for the factory machine application, than other tested hybrids in two experiment periods. The average of the length weight and size of the cocoon filament produced by these 5 hybrids were 888.20-1,070.20 meters, 0.29-0.33 grams and 2.61-3.11 deniors respectively. Nevertheless, there were no significantly difference among the silk qualities produced by these 5 hybrids.