Thats one thing when dealing with adult mice...ha ha...there are all different sizes. I usually start feeding young adults at about 20 g. but my breeders may weigh somewhere around 40 g. I weigh each mouse before I feed and record, so that I know what weight of food my bps have consumed. It is pretty cool to see how much weight is retained compared to the amount of food eaten.

I have been comparing and have seen weight gains from 50 g to 130 g. between feces deposits. I was trying to look for a trend so that I could predict how much weight a bp would gain for the amount of food eaten....but the data is all scattered....maybe once I get a few more bps and keep them for longer something will show