Vol. 7, Issue 11, Part G (2025)

This study presents a detailed demographic evaluation of Bombyx mori Linnaeus reared on the Ber-1 mulberry cultivar through the development of an age-specific life table. The analysis provides critical insights into survivorship, mortality dynamics, and life-expectancy patterns that characterize the population structure of this economically important species. Survival declined progressively from an initial cohort of 100 larvae, with early developmental stages showing strong viability, followed by distinct reductions during mid- and late-instar periods. A temporary stabilization occurred around day 30; however, a sharp decline ensued thereafter, leaving only two individuals alive by day 40, suggesting heightened physiological sensitivity in advanced stages. Mortality trends revealed clear peaks on days 11-14 and 36-39, marking critical windows of vulnerability likely influenced by nutritional limitations or developmental stress. Age-specific mortality rates (100qₓ) highlighted these intervals, with the highest mortality recorded near the end of the life cycle. The decreasing age structure (Lₓ) and rapidly declining life expectancy (eₓ), particularly after day 20, further underscored the progressive weakening of the cohort as development advanced. These demographic patterns indicate that while the Ber-1 cultivar effectively supports early larval growth, enhanced management attention is required during identified stress-prone periods to reduce losses. The findings emphasize the importance of cultivar-specific rearing strategies, optimized feeding schedules, and timely interventions. Overall, this study contributes valuable demographic evidence to guide sustainable sericultural practices and improve the productivity of B. mori across variable rearing conditions.