MySheen

A New Summer and Autumn Variety of Silkworm, Bombyx mori-Xia Fang x Qiubai

Published: 2024-11-06 Author: mysheen
Last Updated: 2024/11/06, Xia Fang Xqiubai is a silkworm variety bred in summer and autumn by setting high temperature environment for many times in Southwest Agricultural University. In 1992 and 1993, we participated in the indoor product comparison identification and rural test in Sichuan Province, and the economic indexes reached or exceeded the control "781X7532" variety. In March 1994, the Silkworm Variety approval Committee of Sichuan Province approved it. Xiafang X Qiubai variety is a summer and autumn variety selected by the combination of cross breeding and systematic separation breeding. Due to the reasonable selection of parents, the breeding scheme

Xiafang X Qiubai is a silkworm variety bred by Southwest Agricultural University through setting high temperature environment for many times. In 1992 and 1993, the silkworm variety "781X7532" was tested in Sichuan Province, and its economic indexes reached or exceeded those of the control variety. In March 1994, it was approved by Sichuan Province Silkworm Variety Approval Committee.

Xiafang X Qiubai is a summer and autumn variety bred by hybrid breeding and systematic segregation breeding. Due to the reasonable selection of parents and correct breeding scheme, this variety has strong pull, high yield, excellent silk quality and easy reproduction, reaching the advanced level in China and being affirmed by experts in the same trade. The cocoon yield per 10,000 silkworms was 17.96 Kg, cocoon filament length was 1268m, and reelability was 75.9%. The purity was 95 points, the cocoon yield was 17.22%, and the cocoon layer per 10,000 cocoons increased by 5.8% compared with the control.

Large area production in rural areas proved that the variety has good health, good breeding, high yield, cocoon yield per gram ant is 2.7% higher than that of the control, and the yield per ten thousand head is 3.6% higher than that of the control. Raising one seed can increase the net cocoon cost of farmers by 3.1 yuan, which improves the economic benefit of farmers.

This variety is a binary hybrid, both of which are bivoltine, tetramolting and female silkworm. Purebred with good breeding, easy mating, high egg production (summer Fang a moth lay 550 eggs, autumn white a moth lay 480 eggs), simple reproduction and other characteristics, seed field willing to reproduce. The general combining ability and special combining ability of this variety were good. After 22 hours shorter instar than CK, F1 hybrid has good health, cocoon yield of gram ant increases 6.9% than CK, yield is high, silk length and elongation rate increase 8.7% and 16.6% than CK, silk quality is good.

More than 10,000 varieties were popularized in Chongqing area, 50,000 in 1992 and 600,000 in autumn 1996. It has become the dominant variety in summer and autumn in Sichuan Province and Chongqing City.

10 000 new varieties yield 320 000 Kg cocoons, dry cocoons unwrapped 259Kg, cocoon loading rate 95%, cocoon drying rate 243Kg, control varieties 280 000 Kg, 272Kg, 92%, 250Kg respectively, then the new varieties produce 1 042 Kg more silk than the control varieties, and the output value will increase by 1 563 000 yuan, minus the extra raw material cocoon cost 32 000 yuan, a net increase of 1 240 000 yuan. The above total income increased by 1.271 million yuan, with a new output value of 1.08 million yuan according to the reduced value of 0.85 yuan.

 
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