-
Rearing Methods and Technical Key Points for Ground Beetles (Eupolyphaga)
(1) Rearing equipment can be designed according to the scale and purpose of rearing. Here we only introduce the rearing equipment used to provide a source of medicinal insects. ① Insect sieves: their purpose is to separate nymphs of different instars, adults and oothecae by sieving within a certain period, and then rear them separately and isolate the medicinal insect bodies. The sieve apertures are divided into 5 specifications: 2-mesh sieve: used when separating out adults. 4-mesh sieve: used when separating out 7th-8th instar nymphs. 6-mesh sieve: used when separating out oothecae and insect feces. 12-mesh sieve: used when separating out 1st-2nd instar nymphs. 17-mesh sieve
-
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
-
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
-
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.
-
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
-
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.
-
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
-
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
-
Detailed Explanation of Key Technical Points and Management Methods for Fish Fry Rearing
After the summer fry are divided into ponds, the 1-year-old fingerlings reared until the end of the year to a size of 12-15 cm and a body weight of 30-40 g are called spring fingerlings. The growth cycle of black carp and grass carp is 3-4 years, and in some places the 1-year-old fingerlings are reared into 500 g 2-year-old fingerlings. 1. Fingerling ponds: To rear large-size fingerlings, it is recommended to build dedicated fingerling ponds with an area of 3-5 mu and a water depth of about 2 m. The preparatory work before the summer fry are stocked into the ponds is the same as for fry ponds. 2. Stocking: There are two methods, monoculture and polyculture. Polyculture is generally adopted. For ponds mainly stocked with common carp, common carp 6
-
条件筛选