Effects of Live Cocoon Reeling on Comprehensive Economic Characters of Silkworm
[Objective]The effects of live cocoon reeling on health,cocoon silk quality,variety characteristics and other comprehensive economic traits of silkworm parents and their hybrid combinations were explored,so as to provide the theoretical basis for the creation,screening and fixation of new materials and the targeted cultivation of new varieties.[Method]From 2019 to 2022,by taking parents ZaoA and LanB as experimental materials,live cocoon reeling experiments were conducted.Four consecutive generations of parents were subjected to live cocoon reeling experiments and subculture conservation was carried out.At the same time,hybrid combination(ZaoA×LanB)were prepared each generation and the parents and hybrid combination(ZaoA×LanB)without live cocoon reeling were used as controls.The age duration,number of diseased 4-instar silkworms,cocoon production,whole cocoon weight and cocoon shell weight were investigated.The cocoon shape,separation count,individual weight and range of live pupal silk reeling cocoons,cutting,knots,silk length and dry weight were observed.The egg amount,abnormal egg amount and hatching status of female moths were investigated.[Result]There were significant differences(P＜0.05)in cocoon formation rate,larva-pupa rate and whole cocoon weight of the parents(ZaoA and LanB)treated with live cocoon reeling and the control group.The improvement of some indicators were related to the feeding season.The knots and cutting times of the parents decreased significantly with the continuous generation of live cocoon reeling,while the cocoon silk length increased significantly.Live cocoon reeling led to a decrease in egg production and poorer egg-attachment of parents.There were significant differences(P＜0.05)in egg production between parents and between parents and control.There was no obvious difference in the development duration(fifth and full age duration),common cocoon rate and cocoon formation rate of hybrid combination(ZaoA×LanB)and the control group.The survival rate of pupae increased certainly,while the cocoon yield per 10 000 silkworms decreased definitely compared with the control.The changes in whole cocoon weight and cocoon shell rate were dynamically related to the season and the overall average was basically equal to CK.There were significant differences(P＜0.05)in cocoon yield per 10 000 silkworms and larva-pupa rate between the treatment group and the control group.There was no difference in cleanness and neatness between the treatment group and the control group.The reelable cocoon rate and reelability increased with the continuous generation of live cocoon reeling.The cocoon silk length,cocoon silk size and number of rush upon in reeling process per myriameter showed dynamic changes and the overall average was basically equal to the control.There were significant differences(P＜0.05)in cocoon silk length and reelability between the treatment group and the control group.[Conclusion]The knot number and cutting times in the parents(ZaoA and LanB)decreased significantly with the continuous generation of live cocoon reeling,and the cocoon silk length increased obviously,the common cocoon rate and cocoon shell rate of the parents were basically the same as that of the control group.The cocoon formation rate of the parents ZaoA and LanB increased by 3.69%and 3.76%in spring,8.13%and 1.70%in autumn;The survival rate of pupae ZaoA and LanB increased by of 4.55%and 6.19%in spring,8.23%and 0.98%in autumn.The common cocoon rate,survival rate of pupae and cocoon quality performance of hybrid combination(ZaoA×LanB)treated with live cocoon reeling increased to a varying degree compared with the control group.The common cocoon rate,survival rate of pupae,reelability and silk length in spring increased by 3.73%,0.84%,3.00%,and 4.34%compared with the control group,while the common cocoon rate in autumn was basically the same as that of CK,and the survival rate of pupae,reelability and silk length increased by 0.67%,3.90%and 1.62%compared with the control group.
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