To add on to this... I was at HHMI Janelia for a while which has an automated rodent cage cleaning contraption with two robot arms. They have all the automation

To add on to this... I was at HHMI Janelia for a while which has an automated rodent cage cleaning contraption with two robot arms. They have all the automation money can buy. It's still __extremely__ labor intensive. Beyond all the routine things... consider that, at least in neuroscience, you often need to perform surgery on each mouse...