PROBLEM TO BE SOLVED: To provide a preservative for a low temperature storage of an animal embryo containing a compound having a flavonol structure, a preservation liquid for the low temperature storage of the animal embryo containing the preservative, and a method of storing the animal embryo at low temperature using the compound having the flavonol structure.SOLUTION: There are provided a preservative for a low temperature storage of an animal embryo containing a flavonoid compound represented by the formula (I), where Rto Rare same or different and -H, -OH or an alkoxy group, a preservation liquid for the low temperature storage of the animal embryo containing the preservative, and a method of storing the animal embryo including immersing the animal embryo in a solution containing the flavonoid compound represented by the formula (I) and storing the solution at low temperature.【課題】フラボノール構造を有する化合物を含む動物胚の低温保存用の保存剤、該保存剤を含む動物胚の低温保存用の保存液、及びフラボノール構造を有する化合物を用いた低温での動物胚の保存方法を提供する。【解決手段】式（Ｉ）：〔式中、R1～R9は、同一又は異なって、-H、-OH又はアルコキシ基である〕で表されるフラボノイド化合物を含む動物胚の低温保存用の保存剤、該保存剤を含む動物胚の低温保存用の保存液、及び式（Ｉ）で表されるフラボノイド化合物を含む溶液に動物胚を浸漬し、該溶液を低温に保持することを特徴とする動物胚の保存方法。【選択図】なし
