shahla Nematollahian; Masoud Alipanah
Abstract
Different types of imported and domesticatedhybrids of silkworm are rearing in different climatic conditions in Iran. The purpose of this study was to compare the performance of silkworm hybrids used in two climatic regions ofIran, namely Shaft in Guilan province and Torbat Heydariyeh in Khorasan Razavi ...
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Different types of imported and domesticatedhybrids of silkworm are rearing in different climatic conditions in Iran. The purpose of this study was to compare the performance of silkworm hybrids used in two climatic regions ofIran, namely Shaft in Guilan province and Torbat Heydariyeh in Khorasan Razavi province.For this study, four Iranian hybrids and 14 Chinese imported hybrids were used in a completely randomized block design. For the studied traitsnumber of cocoons per liter, average weight of a cocoon, and weight of cocoon produced from a box, there was a significant difference(P<0.01) between the hybrids as well as the regions. The results of the present study showed that the performance of silkworm hybrids, regardless of their origin, is more affected by the rearing environment and there is a difference between hybrids in the studied climates. Therefore, selecting the most suitable hybrids for different climates of Iran seem to be essential.
seyyed ziaodin mirhosseini; Shahla Nematollahian; Seyed Hossein Hosseini Moghaddam; Navid Ghavi-Hossein-Zadeh; Ramin Abdoli; Yosof Kheikhah
Abstract
The aim of the present study was to investigate the performance of the hybrids obtained by crosses of the six Japanese silkworm lines named IRA1, IRA3, IRA5, IRA7, IRA9, and IRA11 and six Chinese silkworm lines named IRA2, IRA4, IRA6, IRA8, IRA10, and IRA12. The new hybrids derived from these lines along ...
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The aim of the present study was to investigate the performance of the hybrids obtained by crosses of the six Japanese silkworm lines named IRA1, IRA3, IRA5, IRA7, IRA9, and IRA11 and six Chinese silkworm lines named IRA2, IRA4, IRA6, IRA8, IRA10, and IRA12. The new hybrids derived from these lines along with available commercial hybrids (as control groups) for six traits including cocoon weight, cocoon shell weight, cocoon shell percentage, best cocoon weight, pupation rate and best cocoon pupation rate were measured and recorded in spring 2020. The IRA7×IRA6 and IRA7×IRA12 hybrids had more performance in comparison with commercial hybrids in terms of productive traits including cocoon weight and cocoon shell weight (p<0.01), but, when productive and viability traits (pupation rate and best cocoon pupation rate) were considered together in an evaluation index, they were not among the selected hybrids. Commercial 31×32 hybrid in terms of cocoon shell weight and cocoon shell percentage had more performance in comparison with the other hybrids (new and commercial) (p<0.01). Hybrids had a significant difference for pupation rate and best cocoon pupation rate (p<0.01), and the IRA5×RA12, IRA1×IRA10 and IRA11×IRA6 hybrids showed the lowest mean for both traits in comparison with other hybrids (p<0.01). The obtained results showed that seven hybrids including IRA9×IRA2, IRA11×IRA2, IRA3×IRA6, IRA3×IRA2, IRA7×IRA4, IRA7×IRA10 and IRA7×IRA8 were greater than the minimum set for every six traits. Among these hybrids, some will be chosen in the commercial production line based on their performance in the field and regional experiments to supply the country's required silkworm eggs.