In the current era of highly developed science, technology and technology, the demand for natural fabrics is increasing year by year in the world market, and the world silk industry and science are led to the cultivation of mulberry varieties with high nutritional value and the creation of breeds and hybrids suitable for different seasons of the changing external environment. In recent years, in the Republic of Uzbekistan, the practice of rearing mulberry silkworms several times a year has been used. However, there are no breeds and hybrids suitable for the hot summer conditions of our country, based on this, scientific research has been started in the direction of creating heat-resistant breeds at the Silk Research Institute. In this article, the results of the breeding of 6 breeds and 4 different industrial hybrids of mulberry silkworm under hot conditions are described. Based on preliminary data, Line 1 and Line 2 systems were found to have high embryonic and post-embryonic viability under hot summer conditions. However, the average cocoon weight of these systems was 1.68-1.73 g, cocoon shell weight was 339 mg, and cocoon silkiness was 19.6-20.2%. Based on the obtained results, it was concluded that Line 1 and Line 2 systems can be used as initial selection material for creating heat resistant breeds.

The demand for silk products with high metric number (thin) in the world market is growing every year. The main demand of cocoon processing enterprises in China, India, South Korea, Italy, France and Japan, the leading countries producing silk products, is focused on silk yarns of type 3A, 4A, and 5A. Due to the lack of special mulberries for re-worm feeding, summer-fall worm feeding usually begins after the mulberry trees and mulberries, whose seedlings have been cut down for spring worm feeding, have harvested enough leaf produce. Nutritional degradation of the leaves to worms and hot weather together make it difficult for the worms to eat and digest nutrients during repeated feeding, and the worms slow down the synthesis of silk substance in the silk gland. Therefore, in summer and fall, small, silky-thin cocoons are obtained. At the same time, it is important to try and select breeds and hybrids that are resistant to hot weather conditions and create new breeds and hybrids suitable for the summer and fall seasons. This article describes the results of research conducted on the testing of silkworm breeds and hybrids in the conditions of repeated worm feeding and the selection of the required level in terms of productivity characteristics. In separate experiments conducted during the summer and fall seasons of 2016-2018, the worm viability, cocoon productivity, and germination traits of each breed, system, and breeding hybrid were studied comparatively.

In countries where sericulture is well-developed, there is a pressing need to create new systems, varieties, and hybrids of the Morus alba L. species, which is the only food source for the mulberry silkworm Bombyx mori L. These new systems should be suitable for the care of silkworms, and their nutritional and chemical composition should be studied. The introduction of these new systems into production is considered a crucial problem that needs to be addressed. Research experiments were carried out in 2013-2017 at the Tashkent State Agrarian University and the Silk Research Institute. The results showed that in 2017, the new varieties contained 75.1-74.3% water, while in 2018, the water content was 76.0-77.3%. Meanwhile, the Tajikskaya bezsemyannaya variety showed an increase in this indicator, reaching 75.2-76.2%. However, these results were still lower than the benchmark of 98.8-101.4%. The amount of protein is one of the most important indicators of mulberry leaf composition.

Mulberry silkworm seeds were smuggled to Central Asia by a Chinese princess married to Khotan Khan in the middle of the 4th century. By the 7th century, Khotan, Kusham and other Northern Silk Industry was the main labor activity of the population in the provinces of Turkestan. In the 7th century, as a result of the introduction of the technology of cocooning and gazlam weaving by Marv merchants for commercial purposes from Persia, it became more widespread in the territory of Central Asia. Uzbekistan is a country with a long history among the world's developed silk industry. Mulberry silkworm seeds entered Central Asia through the Khotan province in the middle of the 4th century, and have become one of the main occupations of the population until now. This article analyzes the history of sericulture in Uzbekistan, stages of development, and achievements in the field of research and production. It is planned to increase the total area of mulberry plantations in Uzbekistan from 48,720 hectares in 2019 to 77,422 hectares by 2021, and the number of individual mulberry rows to 79 million 515 thousand bushes. It is also planned to increase the number of boxes of silkworms from 350,000 boxes to 500,000 boxes, from 19,607 tons to 30,000 tons.