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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Sericulture is known as agro-based cottage industry which plays an important role in improving the rural economy because it possesses high employment and income generation capability with minimum investment Hiware, View at Google Scholar Mano Y.

Siljworm defective cocoons include melted cocoons stained cocoons, thin shelled, thin end, deformed and double cocoons.

View at Google Scholar H. In traditional Chinese medicinesilkworm is the source of the “stiff silkworm”, which is made from dried fourth- or fifth-instar larvae which have died of “white muscardine disease”, the Beauveria bassiana fungal infection mentioned above. When the larvae are ready to settle for moult, the appetite will be reduced. Archived from the original on 7 Bivoltinw During the process of breeding composite layings were prepared by utilized fifteen to twenty disease-free layings to ensure large population size with wide genetic base from F1 to F5, and progenies were raised by conducted mass rearing.

It avoids secondary contamination. When loose eggs are incubated and brushed in crowded conditions, the larvae hatched from the lower side of the eggs enter the empty egg shells by crawling and later they can not come out of the shells due silkwomr the presence of bristles on the larval body.


The lower net helps in holding back the egg shell. The quality of leaves fed to silkworm is considered to be the prime factor for good cocoon production Ravikumar, What are the reasons for occurrence of melted cocoons?

The main reasons for poor hatching of loose eggs 1. Avoid over crowding of larvae in the rearing bed 6. Height of the roof should be at least zilkworm ft at wall level. The Chinese guarded their knowledge bivolgine silk, but, according to one story, a Chinese princess given in marriage to a Khotan prince brought to the oasis the secret bivpltine silk manufacture, “hiding silkworms in her hair as part of her dowry”, probably in the first bivoltind of the first century AD. View at Google Scholar N.

How to use rotary mountages? Minimum handling of silkworm larvae. Every time same volume of worms may be measured. The farmers who do not have comb can keep the mountage upright vertically. More quantity of organic manure. The following precautions are to be taken during rain’ season: Sulkworm results of current study revealed that the cocoon yield and economic traits viz. The continued efforts for the improvement of cocoon characters of domesticated silkworm were aimed at increased quality silk production.

The authors are grateful to the Dr. The traits such as larval length, larval width, larval weight, shell ratio, filament length and filament weight showed positive correlation with yield.

What to do with the worms? During late age rearing two feeds are required during rainy season and three feeds during winter and summer season Mulberry shoot should be preserved straight upright and cover w.


Besides this, the cocoon crop stability also relies more on improving other production technologies which have to be explored. Mal Reddy, and R.

Preserve in a cool place covered with wet gunny cloth. Resumption of feeding the rearing bed is done only after all the larvae come out xilkworm moult.

Psyche: A Journal of Entomology

Starvation of larvae in fifth instar leads to poor larval growth, small sized cocoons and in turn low cocoon yield. The single cocoon weight g was recorded as an average of 10 female and 10 male cocoons at random bivolitne using the following formula:.

The obtained data were pooled and analyzed with reference to different seasons and mulberry varieties. How cocoons should be transported after harvesting?

They are covered with tiny black hairs. Hanging wet gunny cloth to doors and windows.


Mal Reddy, and S. What will happen if some un-ripened worms are mounted? When the color of their heads turns darker, it indicates they are about to molt. In shoot rearing without bed cleaning how to manage rearing? They are not monophagous since they can eat other species of Morusas well as some other Moraceaemostly Osage orange.

The heat kills the silkworms and the water makes the cocoons easier to unravel.

Bombyx mori – Wikipedia

Rearing bed should be thin. Cocoons should be transported during the cooler hours. What should be the ideal size for the shoot rearing racks? Archived from the original PDF on 14 March