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Your Position :Home->Past Journals Catalog->2021年58 No.6

Effects of temperature and humidity on the preservation of Cryptotympana atrata eggs
Author of the article:CAO Ye DENG Pan SUN De-Yong TANG Chu-Fei WEI Lan-Jun LIAO Huai-Jian SUN Hong-Wu
Author's Workplace:Jiangsu Academy of Agricultural Sciences, Institute of Leisure Agriculture, Nanjing 210014, China; Xuzhou Junxiao Ecological Agriculture Technology Co. LTD, Xuzhou 221732, China
Key Words:Cryptotympana atrata; egg preservation; temperature; humidity; survival; incubation
Abstract:
[Objectives]  To improve the hatching rate of Cryptotympana atrata eggs and increase the cost effectiveness of breeding this species in captivity. [Methods]  An orthogonal experimental design was used to determine the effects of different temperatures (10, 15, 20, 25 and 30 ℃) and humidity (35%, 45%, 55%, 65% and 75%) on the biological parameters of C. atrata eggs over a 60 day period, including the degree of shriveling, survival, incubation period and hatching rate. [Results]  A temperature of 10 ℃ and humidity of 35%-75% were best; under these conditions the hatching rate was >73% and the average cross sectional thickness of eggs was up to 374.23-400.00 μm. Eggs underwent different degrees of shriveling under the different temperature and humidity conditions. The least shriveling occurred at a temperature of 10 ℃ and a humidity of 35%-75%. A greater amount of shriveling was observed at temperatures of 15-20 ℃ and humidity of 45%-75%, but the most shriveling was observed at temperatures of 25-30 ℃ and humidity of 65%-75%. The number of surviving eggs was highest at temperatures of 10-15 ℃ and humidity of 35%-75%. Fewer eggs survived after storage at 20 ℃ and 45%-75% humidity, and even fewer when stored at 25 ℃ and 75% humidity. The least number of eggs survived after storage at 30 ℃; all eggs stored at 30 ℃ and 35% humidity withered and died after 60 days. At the same humidity, the incubation time and the hatching rate of eggs decreased significantly at higher storage temperatures. There was no significant difference in the hatching rate of eggs preserved under various humidity conditions at temperatures between 10-20 ℃, but the hatching rate of eggs increased significantly with increasing humidity in the 25-30 ℃ range. [Conclusion]  Both temperature and humidity significantly affected the success of preserving C. atrata eggs. 10 ℃ and humidity 35%-75% were the best conditions for preserving the eggs of this species. Lower temperatures reduce the humidity required for successful egg preservation. At temperatures of 15-20 ℃, the higher the humidity, the more eggs survived. Humidity of >65% was required to preserve eggs at 25 ℃, and >75% humidity was required to preserve eggs at 30 ℃.
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