Suitability of mulberry species for pure silkworm races (Ax, Bx, N1 and N2) in the Payakumbuh area, West Sumatera [Indonesia]
1988
Samsijah
To examine the possibility of a foundation of Silkworm Egg Unit in West Sumatra in an endeavor to support the establishment and development of a silk industry in that region, an experiment has been conducted to select mulberry species which seem suitable as pure silkworm races feeding. The experiment was conducted from July until November 1986 in Tabek Panjang, Payakumbuh, West Sumatra using five mulberry species namely Morus alba L; M. nigra L, M. multicaulis P., M. australis P. and M. cathayana Hemsl. The leaves were used to nourish four pure silkworm races i.e. Japanese races (N1 and Ax) and Chinese races (N2 and Bx) and their effects on silkworm survival, growth rate, percentage of pupae, male and female pupae weight, cocoon percentage without pupae filament percentage, fecundity and hatchability were observed. The results of the experiment are: 1. There were significant differences in the growth rate, percentage of pupae, male pupae, weight and fecundity between the silkworm races. 2. Japanese races (N1 and Ax) were better than Chinese races (N2 and Bx) in growth rate, male pupae, weight and hatchability, but Chinese races were better than Japanese races in percentage of pupae, cocoon percentage without pupae and filament percentage. 3. There were significant differences in survival, growth rate, male pupae weight, female pupae weight, filament percentage and fecundity between the silkworm races fed on the five mulberry species. 4. Observation made on 9 responses showed that M. alba was the best species followed by M. cathayana, M. multicaulis, M. australis and M. nigra. 5. To produce silkworm egg in West Sumatra it is suggested to adopt M. alba, M. cathayana and M. multicaulis.
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