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A Detailed Guide to Silkworm Rearing Techniques and Disease Prevention and Control Methods
1. What should be noted when rearing third-instar silkworms? The third-instar stage lasts about 96 hours, of which about 72 hours are spent feeding on mulberry leaves and about 24 hours in molting. Physiologically, third-instar silkworms are still in the young-silkworm stage; their growth rate is slower than that of the first and second instars, their body weight increases 5 to 6 times compared with the second instar, and their adaptability to high temperatures differs somewhat from that of the first and second instars. During rearing, attention should be paid to: (1) The rearing temperature during the third instar is best at 25.5°C to 26°C, with a wet-bulb depression of 2°C to 3°C. (2) The mulberry leaves used in the third instar should be mature leaves, not
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Detailed Explanation of Artificial Rearing Methods and Breeding Techniques for the White-Banded Snake
The white-banded snake, also known as the many-banded krait or the golden-banded white-flowered snake, has high medicinal and economic value. Its rearing methods are as follows: 1. Build ponds properly. The snake pond is built with bricks and stones, 2 m square and 1.5 m high, and can hold 15-20 snakes; keeping too many snakes makes management difficult. The pond walls are smoothed with cement, and a movable glass cap is added on top of the wall in a T shape to prevent escape. The pond bottom is the snakes' activity area, where weeds should be planted, and snake dens should be built with sandy soil, wooden boards, bricks and tiles, etc. Build a flowing water ditch and a bait basin in the pond, and cover the pond with
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Detailed Explanation of Key Technical Points for Intensive Rearing of Broodstock During the Gonadal Transition Period
After the beginning of spring, as water temperature rises, broodstock gonadal development gradually transitions. Especially from early spring to mid-May before spawning, broodstock gonadal transition is extremely rapid, and the ovary coefficient can reach 15%-20%. During this period, doing a good job of intensive rearing management during the broodstock transition period can promote smooth spawning; otherwise, gonadal development will stagnate or even regress. The intensive rearing techniques for broodstock during the transition period are as follows. 1. Timely pond separation. To understand the growth and development status of broodstock and facilitate the arrangement of induced spawning and reproduction, broodstock should be separated into ponds when the water temperature is 10°C. Before pond separation, do a good job of disinfecting the small ponds
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Key Points of Mink Rearing Technology in Northern Regions
Mink belongs to the Mustelidae family and is a carnivorous animal. Its fur has many advantages, including abundant underfur, straight and warm fibers, a soft and glossy appearance, and a noble look when worn. It can be processed into high-grade fine-hair fur, and its products sell very well in developed Western countries. At present, China's fur market is in a period of high prices and tight supply, making this the industry with the highest returns and the best market prospects in the breeding sector. The following is an introduction to mink rearing technology in Northeast China. 1. Mink Breeds Currently, the world's most famous breeds are the American mink and the European mink.
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Detailed Explanation of Rearing Standards and Key Technical Points for Young Silkworms
The key to rearing young silkworms is to master reasonable temperature and humidity, appropriately mature fresh mulberry leaves and reasonable techniques for handling molting and awakening. For leaves used for collecting newly hatched silkworms, the leaf color is yellow with a hint of green, slightly wrinkled; in spring pick the 2nd leaf, in summer and autumn pick the 2nd-3rd leaf. For the 1st instar, use moderately mature leaves that are green with a hint of yellow, with a flat leaf surface, the 3rd-4th leaf, preferably tender rather than old, depending on the climate. For the 2nd instar, moderately mature leaves have a normal green color; for the 3rd instar in spring, three-eye leaves can be used. For the 1st-2nd instars, cut leaves into square pieces 1.5 times the body length of the silkworm, and use strip leaves when expanding the rearing bed. During the spring silkworm season, one can aim for 10 days to the third molt.
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What are the benefits of cooperative rearing of young silkworms? Silkworm farmers who know early benefit early
From hatching to cocoon spinning, silkworms generally go through 4 molts and 5 instars. Instars 1 to 3 are called young silkworms, and instars 4 to 5 are called large silkworms or mature silkworms. The young silkworm stage is the period for building up physical constitution and is the foundation of the entire silkworm rearing period. If young silkworms are raised well, the silkworms have a strong constitution, and in the large silkworm stage they can better resist adverse environments and pathogens. This is beneficial for a bumper cocoon harvest. Therefore, raising young silkworms well is the key to achieving a bumper cocoon harvest. (1) It facilitates scientific silkworm rearing: the young silkworm stage requires higher temperature and humidity, and a dedicated person must regulate and control temperature and humidity day and night.
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How to control the occurrence of silkworm diseases in silkworm rearing
Through practical investigation, we found that in the process of rearing silkworms, the insufficient awareness of silkworm farmers about the harm of silkworm diseases often leads to the occurrence of silkworm diseases, causing serious losses to production. Therefore, how to control the occurrence of silkworm diseases has always been the primary task in sericulture production. 1. Causes of silkworm diseases. Silkworm rearing is a high-density group rearing method, with a large number of individuals reared in a certain area. The silkworms' mulberry eating and excrement are also in the same area. Once disinfection work is neglected, or rearing management is improper, infectious silkworm diseases are prone to occur, causing spread and
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Rearing Methods and Technical Key Points for Male Silkworm Larvae
I. New Hybrid Male Silkworm Varieties (I) Variety Traits. The new autumn-rearing male silkworm variety bred by the Sericulture Research Institute of the Zhejiang Academy of Agricultural Sciences - Qiuhua x Ping 30, has the advantages of a strong constitution, uniform molting and rising at each instar, and being easy to rear. The number of ants per gram is around 2310, the 5th instar takes 6 days and 18 hours, the whole larval stage takes 22 and a half days, the two-day hatching rate is 49.34%, the silk length is around 1240 m, the cocoon shape is oval, large and uniform, the cocoon color is pure white, and the cocoon shell rate and silk yield are high. (II) Key Points of Rearing Technology. For ant reception and light exposure, this can appropriately be done earlier than for common varieties.
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Detailed Explanation of Summer-Fry Rearing Techniques for Jiang Yellow Catfish
1. Pond Conditions The pond area should preferably be 1-3 mu, with a water depth of 1.0-1.5 m, rectangular, oriented east-west. The bottom silt should not exceed 10 cm, the pond embankment should be firm and not leak, and its height should exceed the highest water level by 0.3-0.5 m. The pond bottom should be flat and sloped toward the drainage outlet, with ample water supply and convenient water intake and drainage. 2. Preparation Before Fry and Fingerling Stocking 20-30 days before fry stocking, drain the pond water and sun-dry the pond, remove weeds and debris from the pond, and clean up the bottom silt. About 15 days before stocking, add water
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Detailed Explanation of Key Techniques for Autumn Fish Fingerling Rearing
Autumn water temperature generally fluctuates between 20°C and 30°C, making it a good period for fish growth. It is especially the fattening season for smaller, weaker fingerlings, so farmers must effectively strengthen fingerling rearing. Disinfect and clear the pond. For old fish ponds converted to new ponds for fingerling rearing, after several months of rearing in spring and summer, water quality gradually deteriorates, dissolved oxygen and natural food organisms decrease, and pathogenic microorganisms increase, which can stunt fingerling growth. Grass carp fingerlings in particular are more prone to disease in such old ponds. At this time
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