夏秋品种两广二号引进试验初报

石泉县蚕种场2011年春季引进两广二号与秋丰×白玉这两对品种的原种进行试繁,夏季对生产的一代杂交种进行对比试验。试验表明:两广二号繁育系高,体质强健好养,单位质量桑叶的产茧量及产值高,丝质优,可作为陕南蚕区夏秋用家蚕品种的更新换代品种。     

冷藏时间对两广二号越年种孵化率影响试验初报

为探索两广二号蚕种冷藏期限问题,2018—2019年进行了冷藏时间、繁育期对两广二号越年种孵化率的影响试验。试验表明:冷藏时间与两广二号孵化率呈极显著负相关,与皓月×菁松孵化率相关不显著;两广二号不同繁育期、冷藏时间及二者交互作用的孵化率差异极显著;两广二号春制越年种冷藏安全期为111 d,秋制种冷藏安全期为162 d。     

两广二号一代杂交种对NPV的抗性研究

家蚕血液性脓病是夏季养蚕极难控制的毁灭性蚕病,通过开展两广二号一代杂交种对NPV的抗性研究试验,得出结论:两广二号品种对NPV多角体病原具有很强的抗性,是陕南地区当前最适合饲养的夏用品种。     

两广二号蚕品种秋季人工饲料饲养试验

两广二号蚕品种的1～2龄蚕用人工饲料饲养与桑叶饲养对比表明：全蚕期经过人工饲料饲养比桑叶饲养平均延长了13 h;良蛹率、全茧量、茧层率和 400 头蚕的产茧量等指标人工饲料饲养的蚕比桑叶饲养的蚕分别平均低3.82%、1.46 g、1.08%和19.74 g;茧丝长、解舒率、解舒丝长差异不明显;茧丝纤度、缫折、万米吊糙、清洁、洁净等接近。认为两广二号品种适宜人工饲料饲养。     

Influences of Cold Storage at 5℃ for Different Durations on Oviposition of Female Silkworm Moths

In order to investigate the resistance of female silkworm moths to cold storage and their copulation and oviposition after cold storage, copulation and ovipo- sition experiments of Liangguang 2 silkworms and Guican 1 female silkworm moths were conduced under cold storage at 5 ~C for different durations. The results indi- cated that, after cold storage at 5 ~C with relative humidity of 75%, the resistance of female silkworm moths to cold storage varied with different varieties; to be specific, 9-Fu and 7.Xiang, parent silkworm varieties of Liangguang 2 with ancestry of mul- tivoltinism, were relatively resistant to cold storage, and their copulation capability was still at a high level after cold storage for 72 h. Oviposition capability also varied with different varieties and durations; to be specific, under 5 ~C conditions, between two parent silkworm varieties of Liangguang 2, female silkworm moths of 9-Fu achieved the best results within cold storage duration of 24 h, female silkworm moths of 7.Xiang achieved the best results within cold storage duration of 72 h; be- tween two parent silkworm varieties of Guican 1, female silkworm moths of Xinhang achieved the best results without cold storage, female silkworm moths of 826 achieved the best results within cold storage duration of 48 h.     

两广二号杂交原种不同时间点交配的产卵规律调查分析

[目的]明确两广二号杂交原种的产卵规律及最适交配时间,为有效缩短蚕种卵龄差及改进蚕种制种管理技术措施提供参考依据.[方法]以两广二号杂交原种4个品种(芙蓉×932、932×芙蓉、湘晖×7532、7532×湘晖)的母蛾为试验材料,调查不同品种在不同时间点交配其母蛾在各时段产卵量占总产卵量的百分比及单蛾产卵量和不良卵率,找出两广二号杂交原种不同交配形式的产卵规律.[结果]同一品种不同时间点交配的产卵规律有所不同.中系品种(芙蓉×932和932×芙蓉)拆对后产卵有明显的产卵高峰期和产卵低谷期,产卵曲线呈波浪形,其中于8:00和9:00交配的母蛾产卵不集中,产卵时间跨度长;而于10:00和11:00交配的母蛾拆对后迅速产卵并达产卵高峰期,产卵相对较集中.日系品种(湘晖×7532和7532×湘晖)各时间点交配的产卵规律基本一致,产卵趋势较平稳,均在拆对后迅速产卵,每个时段的产卵量随产卵时间的推进逐渐减少.4个品种不同时间点交配对其单蛾产卵量、不良卵率的影响不明显,但从双因素方差分析结果来看,各品种间的单蛾产卵量、不良卵率存在极显著差异(P<0.01).[结论]不同时间点交配对产卵高峰期和产卵集中度有影响,对单蛾产卵量和不良卵率无明显影响,但其发生规律存在差异.生产上应根据家蚕母蛾产卵规律适当调整母蛾交配、拆对、投蛾和收蛾等的时间点,蚕种保护及浸酸也可参考母蛾产卵规律进行相应处理,减少卵龄差,提高蚕卵孵化整齐度及孵化率.