This paper deals with the manual ova hatching of Rana chinensis . It is eviden that there are three different periods in the ova eclosion. The first period is at 75～80℃of effective water cumulative temperature. The ...This paper deals with the manual ova hatching of Rana chinensis . It is eviden that there are three different periods in the ova eclosion. The first period is at 75～80℃of effective water cumulative temperature. The peak period is at 100～120℃. The end is at 120～140℃. The most suitabale temperature of ova eclosion is 11～13℃. In this case, the eclosion speed is 1.6～2.2, and incubation period is 9～12 days,with the rate of eclosion over 80%. Manual hatching can increase the eclosion speed of ova. It is 10%～60% higher than CK, and also 25%～100% higher than the outdoor.展开更多
本文对Borisuk M T和Tyson J J在[1]中所提出的一个有关蛙卵有丝分裂的平面三次系统模型证明了鞍结点不变圈的存在性,给出了鞍结点不变圈所在的空间区域和所对应的参数区域.所得结果严格地证明了[1]中给出的数值结果.此外,我们还给出了...本文对Borisuk M T和Tyson J J在[1]中所提出的一个有关蛙卵有丝分裂的平面三次系统模型证明了鞍结点不变圈的存在性,给出了鞍结点不变圈所在的空间区域和所对应的参数区域.所得结果严格地证明了[1]中给出的数值结果.此外,我们还给出了从此鞍结点不变圈分支出极限环的条件.展开更多
文摘This paper deals with the manual ova hatching of Rana chinensis . It is eviden that there are three different periods in the ova eclosion. The first period is at 75～80℃of effective water cumulative temperature. The peak period is at 100～120℃. The end is at 120～140℃. The most suitabale temperature of ova eclosion is 11～13℃. In this case, the eclosion speed is 1.6～2.2, and incubation period is 9～12 days,with the rate of eclosion over 80%. Manual hatching can increase the eclosion speed of ova. It is 10%～60% higher than CK, and also 25%～100% higher than the outdoor.
