BIVOLTINE SILKWORM PDF
Twenty-six bivoltine silkworm (Bombyx mori L.) genotypes were tested along with two check varieties (NB 4 D 2 and SH 6) for their performance. PDF | On Feb 27, , Zafar Iqbal Buhroo and others published Rearing Performance of Some Popular Bivoltine Silkworm (Bombyx mori L.). multiplication of silkworm breeds st P4lP3lPZ leaels and maintenance of . The bivoltine silkworms produce cocoons with high raw silk recovery and bivoltine.
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Journal of Entomology, If immature worms are mounted, the cocoon quantity and quality are deteriorated.
The number of fertilized eggs hatched synchronously in a brood was taken as a measure to calculate the percentage of hatching by using the following formula: The work in [ 44 ] demonstrated that silkworms are more sensitive to high temperature during 4th and 5th instars. Care solkworm be taken to avoid the ants and other predators. Silkworm rearing was conducted following the standard method under the recommended temperature and relative humidity till 2nd day of 5th instar.
Psyche: A Journal of Entomology
These enzymes are destructive to the silk and can cause the silk fibers to break down from over a mile in length to segments of random length, which seriously reduces the value of the silk threadsbut biviltine silk cocoons used as “stuffing” available in China and elsewhere for doonas, jackets etc.
What are the different methods of mounting and which one is most suitable? To settle for uniform moulting the following cares are to be taken up. What are the reasons for non-uniform hatching? Such drastic change is usually obtained as it is low heritable trait in the silkworm and is prone to large variations siljworm environment and management [ 47 ]. Adult Bombycidae have reduced mouth parts and do not feed, though a human caretaker can feed them.
The silkworm was domesticated from the wild silkmoth Bombyx mandarinawhich has a range from northern India to northern ChinaKorea, Japan, and the far eastern regions of Russia. The reasons for occurrence of defective cocoons are: View at Google Scholar P. In accordance o the single cocoon weight, the highest yield for larvae was observed in S 1 8.
Frequent feeding with less feed. It is not advisable to shift the layings before black boxing. How to distribute larvae equally on rotary mountages? These changes have made the domesticated strains entirely dependent upon humans for survival. All the larval characters and economic traits of cocoon positively correlated with cocoon yield.
View at Google Scholar. Larvae show rapid uniform growth and compensate water loss.
Is it advisable to transport the cocoons on the top of the bus? Form, Function and Diversity. The healthy larvae in the rearing trays were enumerated and unhealthy or dead larvae removed periodically.
The domesticated silkworm derives from Chinese rather than Japanese or Korean stock. The highest mean larval length Effect of feeding leaves of Morus alba and Morus Leavigata on larval growth and silk yield of silkworm, Bombyx mori. This study was aimed to assess the impact of different mulberry varieties namely S 1S 13SS and TR 10 and seasons viz.
Bombyx mori – Wikipedia
View at Google Scholar T. How these cocoons are formed?
The highest shell weight 0. Five cocoons randomly selected were reeled to find out the filament length of the cocoon using eprouvette and it silkwkrm determined by adopting the following formula:. The newly hatched tiny larvae were brushed on rearing trays and offered chopped tender leaves to them. About 2, to 3, cocoons are required to make a pound of silk 0.
By this method larvae can be distributed equally. Physical and silkwodm properties of leaves directly influence the amount of leaf consumption and digestion Das and Vijayaraghavan, ; Ghosh et al.
The nutritional effects of different mulberry varieties on biological characters in silkworm. Researchers at the MIT Media Lab experimented with silkworms to see what they would weave when left on surfaces with different curvatures. Generally it takes 6 dm to complete the pupation.
BIVOLTINE SILK WORM REARING
The polyvoltine type of mulberry silkworm can only be found in the tropics. Due to uniformity in egg number, evaluation of silkworm hybrid is more accurate and scientific. Domestic silkmoths are closely dependent on humans for reproduction, as a result of silkwormm of selective breeding. The authors are grateful to the Dr.