Browsing by Author "Sanchez, Marybel L."

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    Multivoltine silkworm lines, Bombyx mori L. in the Philippines:
    (International Journal of Biosciences, 2022-06-30) Ulat, Maricris E.; Abuan, Julieta P.; Supsup, Gemma E.; Viduya, Marlyn M.; Sanchez, Marybel L.
    A multivoltine silkworm breed can produce quality silk seed with considerable resistance to diseases. The study isolated and characterized multivoltine breeds at the Sericulture Research and Development Institute in Northern Philippines, and evaluated their performance on four quantitative characters such as single shell weight (SSW), single cocoon weight (SCW), cocoon shell percentage (CSP) and cocoon yield per box CYB-1) in three rearing seasons (January-February, August-September and October-November). Locally acquired silkworm hybrid cocoons were processed and isolated following the Mass Selection Method. The study was laid out in Randomized Complete Block Design with 3 replications. Data gathered were subjected to Analysis of Variance (ANOVA) and further tested using Least Significant Difference (LSD). Three multivoltine breeds were isolated and characterized DMMMSU 1002, DMMMSU 1003 and DMMMSU 1016. In January-February season, DMMMSU 1002 performed better than the check breed, DMMMSU 1000 in all the economic parameters tested, but only on SSW in August-September; SCW and CYB-1 in OctoberNovember seasons. DMMMSU 1003 performed better than DMMMSU 1000 in all the parameters evaluated in January February; for SSW in August-September); and SCW in October-November rearing seasons. DMMMSU 1016 performed better on SSW and CSP (January-February); CYB-1 (August-September) and SSW, SCW and CSP in October-November rearing season. Based on these findings, the newly isolated lines can be used as potential parents of superior silkworm hybrids for higher cocoon yield.
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    On-station yield trial evaluation of promising silkworm hybrids in the Philippines
    (International Journal of Biosciences, 2024-10-06) Supsup, Gemma E.; Abuan, Julieta P.; Ulat, Maricris E.; Viduya, Marlyn M.; Sanchez, Marybel L.; Supsup, Roel D.
    On-station silkworm rearing trials were done in three distinct seasons (January-February, April-May, and July-August) at the Sericulture Research and Development Institute in Bacnotan, La Union, Philippines to evaluate the cocoon yield and quality of the five (5) newly-developed bivoltine silkworm hybrids (DMMMSU 108 x DMMMSU 119, DMMMSU 110 x DMMMSU 113, DMMMSU 110 x DMMMSU 119, DMMMSU 119 x DMMMSU 110), and DMMMSU 119 x DMMMSU 108). These were compared to the local single cross bivoltine hybrid, DMMMSU 222in terms of cocoon characteristics such as cocoon yield, effective rearing rate, single cocoon weight, and cocoon shell percentage. The data gathered were statistically analyzed using the Analysis of Variance (ANOVA) in Completely Randomized Design (CRD). Tukey’s Honest Significant Difference (HSD) was used to test the significance among all the hybrids and against the control hybrid. The results revealed variations in the performance of the different hybrids on cocoon characters and in different rearing seasons. Among the five new hybrids, DMMMSU 119 x DMMMSU 108 consistently performed better than the controlin terms of effective rearing rate (ERR) and cocoon yield per box (CYPB), particularly in the July–August and January–February seasons. DMMMSU 108 x DMMMSU 119 also performed better over the control hybrid when reared in the April to May and July to August rearing seasons. DMMMSU 110 x DMMMSU 119 performed betterthan the control hybrid during the January to February rearing season. Overall, these hybrids are recommended for further trials in the farmer’s field for validation.