< Topic > Offer of the composition for semen dilution retention which natural animal origin component such as serum is not included, at the same time same as the dilution liquid and the like for former retention or can maintain the semen vital force above that.Solutions Same as the dilution liquid and the like for former retention or the composition for semen dilution retention which can maintain the semen vital force above that was discovered excluding natural animal origin component such as serum, with the other components and adjusting density.< Selective figure > It is not【課題】 血清等の天然の動物由来成分を含まず、かつ従来の保存用希釈液等と同程度又はそれ以上の精液活力を維持し得る精液希釈保存用組成物の提供。【解決手段】 血清等の天然の動物由来成分を除き、その他の成分及び濃度を調整することによって、従来の保存用希釈液等と同程度又はそれ以上の精液活力を維持し得る精液希釈保存用組成物を見出した。【選択図】 なし