Wild jaundice is captured in a large number of devastating, the number is decreasing day by day, more and more can not meet the needs of artificial breeding, the development of self-cultivation and self-cultivation of Astragalus is the inevitable trend of artificial breeding of Astragalus. The self-reproducing seedlings grow fast. After the individual has reached more than 10 grams, the survival rate is almost 100% throughout the breeding period. The self-propagation of seedlings has provided reliable breeding sources for their own breeding, which is particularly important for the scale farmers. 1. Astragalus membranaceus has natural reproduction and soil reproduction. It is possible to build a breeding pond for astragalus membranaceus or use commercial ponds, spread 20-30 centimeters thick silt, plant a water hyacinth every 30 centimeters, and then inject water to kill insects. Before mid-May, the species should be released, and the females and the strong males should be selected for their fertile eggs. The breeding pool should be placed at a rate of 2 to 6 per square meter. The proportion of males to females should be determined according to the individual size, generally 1-3:1. II. Astragalus membranaceus natural reproduction without soil reproduction can be directly used commercial soilless aquaculture pond, do not have to build breeding ponds, after the completion of oviposition spawning species will be reared collectively, vacate the eel pond irregular acquisition of astragalus for commercial aquaculture , can increase the utilization of Dianchi Lake, thus reducing the cost of reproduction. Third, semi-artificial reproduction
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In late May, the species began spiting and spawning eggs spawning, spit spawning and spawning markers to collect seedlings. The eggs are floating on the water by the foam tray. Generally, the young seedlings are hatched within 6-7 days. After 5-7 days, the young seedlings disappear. At this time, the dried seedlings are laid to find the production hole to collect the seedlings. The collected seedlings are put into the nursery pond for cultivation in time. . After the seedlings are collected, the mud, water grass and water are reset in time to facilitate breeding of other species.
To cultivate fertility, we can lay 5 centimeters of earthworm excrement under the water in the breeding pond. Only the middle part of the aquaculture pond (about 50 centimeters from the edge of the pool) should be laid. According to the total area of ​​Dianchi Lake, 2-5 species of seedlings will be planted per square meter, and it will be better to put them before the end of April and the latest will not be later than the first half of May. Feed a large amount of fly maggots, quail, liver, fish, etc. daily, and feed as much as possible. When the sun is strong, the sun shade nets in Dianchi are shaded.
After the discovery of the foam, wait 12-16 days to collect the young seedlings; if the water temperature is higher, the seedling time should be appropriately advanced (10-12 days). Grab the method: gently move the grasses of the spawning Astragalus to the edge of the pool, and quickly remove them with a rag to dip the net. The movement should be light and care should be taken not to remove the species. If the species is still in the net, it should be It catches it and puts it back into the pool. The nets that lived in the nets were cleaned, and the plants without seedlings were picked up. The plants with seedlings were put together with aquatic plants in a nursery pond for cultivation. The places where fish were picked up should be re-arranged to facilitate spawning by other jaundice.
In May 2000, several testers from the Fisheries Department of Sichuan College of Animal Husbandry and Veterinary Medicine finally succeeded in screening out two groups of drugs with obvious effects through comparative tests on a large number of oxytocin drugs under different conditions. After the oysters have been spawned, about 60% of the astragalus can spawn naturally within 48 hours. In this way, a large number of seedlings can be obtained in a short period of time using limited ponds. In June 2005, a research institute in China improved the above tests, and the mature egg-laying rate of mature pro-flies within 48 hours after production reached 80%. According to tests conducted in 2006, semi-artificial reproduction of Astragalus membranaceus is feasible, but breeding and breeding must be done well in advance. Individuals with larger, well-developed male and female relatives do a better job of oxytocin production, which is fundamental to achieving an ideal reproductive effect. The direction of semi-artificial propagation of Astragalus is correct, but there are still further improvements in its breeding techniques.
Female eggs grow in size, and ovulation can be initiated when free eggs are seen from the abdomen. The oxytocins were LRH-A5 and DOM. The dose of each female was 5 micrograms and 3.3 micrograms. Diluted with normal saline. The amount of the injected fluid was not more than 0.2 ml. The amount of male hormone was halved. Females were first selected for intramuscular injection of the back and then placed in a lush soilless pool at a density of 2 per square meter, and the water inlet switch was turned on to allow micro-flowing water in the pool. Males were injected at intervals of about 48 hours, and then put into a soilless pool that had been placed in females at a density of 1-2 per square meter. Under normal circumstances, about 24 hours after investing in males, females start spawning. In about 15 days, the male and female eagles in the breeding pond are all removed, and the small seedlings in the pool are collected and concentrated. The vacated Dianchi Lake can also be used for the second batch of intimidating production.