PROBLEM TO BE SOLVED: To provide ice seeding means not requiring separate complicated procedures in cryopreservation of sperms or fertilized eggs and also capable of forming ice crystal with high certainty.SOLUTION: A straw tube A is provided, in which: a solution containing sperms/fertilized eggs is housed inside a hollow part 2 a plug part 1 formed on one end A1 side comprises three layers which are an inner plug 11, a powder layer 12 and an outer plug 13 arranged in this order from the hollow part 2 side the powder layer is formed of mixed powder containing hygroscopic coagulating material powder and an ice nucleus substance. The ice nucleus substance contained in advance in the plug part 1 of the straw tube functions as an ice nucleus, and when freezing the sperms/fertilized eggs, an operator can perform ice seeding automatically without performing separate complicated procedures but only performing the conventional freezing procedures. Further, the ice nucleus substance is retained at a position that comes into contact with the solution containing the sperms or fertilized eggs inside the straw tube before performing seeding of the ice nucleus, thereby the ice crystal can be formed with high accuracy and certainty.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】精子・受精卵の凍結保存の際における別途の煩雑な手順などを必要とせず、なおかつ高い確実性で氷晶を形成させることが可能な植氷手段の提供。【解決手段】中空部2内に精液又は受精卵を含む溶液が収容されるストロー管Aであって、一端A1側に形成された栓部1が、中空部2側から順に内側栓11、粉末層12、外側栓13の三層で構成され、粉末層が、吸湿凝固材粉末及び氷核物質を含有する混合粉末で形成されたストロー管Aであって、予めストロー管の栓部1内に含有させた氷核物質が凍結の際に氷核として機能し、精子・受精卵の凍結を行う際に、作業者が、従来の凍結手順のみにより、別途の煩雑な手順を行わなくても自動的に植氷させることができ、また、ストロー管内の精液又は受精卵を含む溶液と接する位置に予め氷核物質を留置させ、氷核の植え付けを行うことにより、高い精度・確実性で氷晶を形成させることができるような構成とする。【選択図】図1
