What about the used mice?

Tell me about Japan's handling method. Experimental mice are generally used for research, but a few are not dead but useless. For example, tumor research makes mice suffer from cancer in various ways, so it needs humane treatment. First, humanized implementation, the most commonly used is carbon dioxide suffocation and inhalation anesthesia to alleviate pain. The second is to temporarily freeze and preserve the mice after execution, and after a certain amount or time, bury them in a centralized way (the organized animal carcasses are also buried together). Third, units that use animals a lot, such as the National Research Institute, have animal comfort films. Every year, the director or deputy director of the institute will make a speech, and all researchers will participate in it, mourning and thanking the experimental animals. Fourth, even so, the National Research Institute often closes for fear of protests from animal protection organizations. Japan's local religious pantheism, everything is God, and dead mice are no exception, so it's not surprising to mourn for mice, but I'm not sure whether other countries are like this.

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