不同产卵时间段对春柞蚕卵主要生产性能影响的研究

The effect of different egglaying times on the mainperformance of spring tussah eggs

摘要:

以抗大×9906的83个优良母蛾为试验材料，产卵两昼夜，进行产卵数量、产卵重量调查和抗病性测试。结果表明，0～24 h产卵数及单粒卵重均极显著高于24～48 h产下卵数。两昼夜卵重的差异以0～24 h产卵数占到总卵数90%以上者最大，平均单粒相差1.44 mg。相同时间段产下卵不同个体间卵重的差异要远小于产卵数量的差异。以0～24 h产卵数占总卵数量80%及以上蛾区作为试验蛾区卵面添食不同浓度的ApNPV病毒，蚕期发病率0～24 h卵LC₅₀为9.67×10⁶，24～48 h卵LC₅₀为5.74×10⁵，二者相差15倍，添食相同浓度病毒，0～24 h卵的抗病性极显著强于24～48 h卵。该结果为春柞蚕选种、繁种和制种保留0～24 h卵提供了试验依据。

Abstract:

Using 83 female moths of the Kangda×9906 strain, we investigated oviposition quantity, egg weight, and disease resistance during a two-day oviposition period.The results revealed that both egg quantity and average weight per egg during 0~24 h were highly significantly higher than during 24~48 h.Maximal egg weight difference(1.44 mg/egg)occurred when>90% of total eggs were laid within 0~24 h.Intra-period egg weight variation was far smaller than inter-period quantity variation.In moth groups with≥80% eggs laid in 0~24 h,ApNPV(Antheraea pernyi Nucleopolyhedrovirus)was applied via surface contamination.LC₅₀ for 0~24 h eggs(9.67×10⁶)was 15-fold higher than for 24~48 h eggs(5.74×10⁵).0~24h eggs showed significantly stronger resistance to identical virus concentrations.These results support prioritizing 0~24h eggs for selective breeding and preservation in spring tussah silkworm propagation.