A New Summer and Autumn Variety of Silkworm, Bombyx mori-Xia Fang x Qiubai
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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Identification skills of excellent racing pigeons
Select good racing pigeons, just like picking athletes. There are two major categories of carrier pigeon competitions in the world: one is the "evaluation race", and the other is the speed race, which is divided into short-and medium-distance, long-distance and ultra-long-distance races. A good carrier pigeon must be of the right size. Balance and coordination are the most important conditions for a good racing pigeon to show by its appearance, while length and weight are closely related to whole body balance and coordination. In the team of champion pigeons, there may be racing pigeons that are too big or too small, but most champion pigeons are of medium size.
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It is good to feed the rabbits with fat in winter.
The winter weather is cold and the temperature is low. If 2%-3% fat is added to the rabbit diet (cooked lard is the best, followed by vegetable oil), it can not only improve the palatability of the rabbit and promote its healthy growth, but also increase the body fat and accumulation of the rabbit. so as to improve the rabbit's resistance to cold in winter. According to the practice of the author's rabbit industry base for many years, adding oil to the feed of pregnant female rabbits can increase the survival rate of young rabbits by about 10%, and adding oil to the diet of mother rabbits during lactation can obviously improve the survival rate of weaning rabbits.
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