A method for increasing the production of leeches overwintering
A technology of leeches and production, applied in the field of medicinal animal breeding, to achieve the effect of increasing economic benefits
Active Publication Date: 2021-12-10
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology
In recent years, 17β-E2 has been widely used in aquaculture, but there are few research reports on leech farming
Method used
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specific Embodiment 1
[0046] Select leeches with a body weight of 6.0±0.5g and place them in a plastic bottle with a volume of 2L for 6 weeks and then hibernate naturally for 60 days, 5 leeches per bottle. The implementation site is at the Institute of Traditional Chinese Medicine of Nanjing Agricultural University. Add the hormone 17β-E2, so that the concentration of 17β-E2 in the breeding water is 25ng·mL -1 . Change the water once every 3 days, using tap water that has been aerated for 24 hours, and the water change time is around 3:00 p.m., 100% of the water is changed each time and the residual snails are removed. After changing the water, feed the fresh pear-shaped snails that have been temporarily raised in tap water for 3 days after cleaning. During the breeding process, dead leeches were found and cleaned up in time. The final yield of dried leeches equivalent to about 155.4 kg per mu.
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The invention provides a method for increasing the overwintering yield of leeches. The purpose of the present invention is to provide a breeding method that significantly improves the survival rate, promotes the growth of overwintering leeches and increases economic benefits on the basis of the existing leech cultivation. Compared with ordinary overwintering, the invention increases the survival rate of the leech after overwintering by 8%, the maximum output by about 43.99%, and the content of antithrombin by 10.73%. The invention improves the economic benefit of the leech cultivation without enlarging the leech cultivation area. Compared with the existing leech breeding technology, applying the present invention to add 17β-E2 for 6 weeks before overwintering for a short period of time, and after 60 days of hibernation, not only can improve the internal quality of leeches, but also can increase the dry weight of leeches by up to about 22.0 kilograms per mu (with According to the current market price of 1000 yuan / kg, the increase in economic benefits per mu is about 20,000 yuan.
Description
1. Technical field [0001] The invention relates to a method for increasing the overwintering output of leeches, which belongs to the field of medicinal animal breeding. 2. Background technology [0002] Leech (Whitmania pigra Whitman), also known as wide-bodied golden thread leech, is the main base animal of leech, a traditional Chinese medicinal material in the Chinese Pharmacopoeia (2015 edition). The whole body is dried and used as medicine. Due to overfishing, environmental pollution and other reasons, the resources of wild leeches have declined sharply. In recent years, a lot of research has been done on the biological characteristics of leeches, digestive physiology, respiratory physiology, breeding density, etc., and artificial breeding of leeches has initially succeeded. Studies have found that leeches have the habit of hibernation. Under natural conditions, when the ambient temperature is lower than 10°C, the leech stops eating, and when the ambient temperature is ...
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IPC IPC(8): A01K61/40
CPCA01K61/40
Inventor 史红专郭巧生王帅
Owner NANJING AGRICULTURAL UNIVERSITY