Guangyou No. 1

Jingyou (R Jingsong) is an artificial-feed-adapted silkworm variety developed through hybridization and backcrossing between Chinese-line, broad-feeding strains and Jingsong A, followed by selective breeding under artificial-feed rearing conditions. It belongs to the Chinese strain group, exhibits diapause, and has four instars.

Keywords:

Silkworm eggs

Category:

Spring

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+86-15653666998

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Guangyou No. 1

Keywords:

Category:

Spring

Consultation Hotline:

400-660-5555

Detailed Information

With the continuous innovation and transformation of sericulture practices, artificial-feed silkworm rearing has gradually scaled up. To meet the evolving production model, the development and breeding of artificial-feed silkworm varieties have become a primary focus of current research and breeding efforts. The characteristics of the Guangyou No. 1 variety are hereby presented as follows:

1. Original Varietal Traits
Jingyou (R JingSong) is an artificial-feed–adapted silkworm strain developed through hybridization and backcrossing between a Chinese–lineage, broad‑host‑range variety and JingSong A, followed by selective breeding under artificial‑feed rearing conditions. It belongs to the Chinese lineage, exhibits bivoltine development with four larval instars. Eggs are grayish‑green with a hint of gray‑green; first‑instar larvae are dark brown; mature larvae are bluish‑white; the silk is pure white; cocoons are white and short‑oval in shape. The induced‑eclosion period lasts 10 days, the total larval duration is 21–22 days, and the pupal diapause lasts 16–17 days. When reared on spring mulberry leaves, the average cocoon weight is 2.03 g, the cocoon shell weight is 0.50 g, and the cocoon shell ratio is 24.63%. This strain develops one day faster than JingSong; however, overwintering stock from the original strain tends to hatch poorly, so it is advisable to propagate overwintering seed in the autumn for production purposes.
Haoyou (R Haoyue) is an artificial-feed-adapted silkworm strain developed through hybridization and backcrossing between a Japanese broad-host-range variety and Haoyue A, followed by selective breeding under artificial-feed rearing conditions. It belongs to the Japanese lineage, exhibits bivoltine development with four larval instars. Eggs are gray-brown; first-instar larvae are dark brown; mature larvae are bluish-white; patterns are typical; cocoons are white with a shallow constricted waist. The induced-eclosion period lasts 10 days, the total larval duration about 22 days, and the pupal stage approximately 18.5 days. When reared on spring mulberry leaves, the average cocoon weight is 1.70 g, the cocoon shell weight 0.41 g, and the cocoon shell ratio 24.12%. This strain develops one day faster than Haoyue; its spring reproductive performance is unstable, with both primary broods and secondary egg-laying occurring, making overwintering difficult. For overwintering, it is best to rear autumn broods.
2. Hybrid Traits
The F1 hybrid combination of this variety exhibits excellent hatchability, robust constitution, rapid development, and uniform dormancy and pupation. In the reciprocal cross, egg color is bluish-gray with a hint of gray-green; mature larvae are bluish-white with scattered spots. In the reverse cross, egg color is gray-brown; mature larvae are bluish-white with scattered spots; cocoons are white with moderate shrinkage and fine texture. Under spring rearing conditions using mulberry leaves throughout the entire life cycle, the total rearing duration is 12.5 hours shorter than that of the control variety Jingsong × Haoyue; larval-pupal survival rate is 93.64%; cocoon yield per 10,000 larvae is 21.18 kg; cocoon shell ratio is 24.29%; raw cocoon silk extraction rate is 19.59%; cocoon silk length is 1,302.8 m; unraveling rate is 82.02%; and cleanliness score is 94.97. The variety demonstrates excellent feed intake on artificial diets: when reared on M10 artificial diet during the first two instars, the 24-hour hair-removal rate and the 192-hour third-instar hatch rate are 20.02% and 17.4% higher, respectively, than those of the control variety Jingsong × Haoyue.
3. Husbandry Requirements for Hybrid Animals
① Suitable for rearing young silkworms on artificial feed, rearing mature silkworms on mulberry leaves, or rearing the entire life cycle on artificial feed. ② Artificial-feed rearing of young silkworms requires high temperature, high humidity, and darkness. When transitioning from artificial feed to mulberry-leaf rearing, the first batch of mulberry leaves should be relatively tender, and the temperature and humidity conditions should be maintained at higher levels for protection. ③ Silkworms enter dormancy quickly and have a short developmental period; therefore, timely expansion of rearing trays and division of trays are essential. ④ Mature silkworms consume large amounts of mulberry leaves; it is important to ensure they have access to high-quality mulberry leaves and eat until fully satiated. ⑤ Mature silkworms emerge simultaneously and begin spinning cocoons rapidly, making them well suited for grid-style rearing.

Automatic clustering of clusters.