Ok so I know all boa's and BP's grow a different rates and that there is no set definition on when to upgrade in food size by age I do know with BP's you can determine by weight if you need to move up in size and also with boas you never feed any thing bigger in girth than they are. The three boas I acquired range in weight from 800-1000g the two smaller ones ate their first meal with me of 2 7week old rats apiece totaling approximately 220-250g combined and the larger one ate 1 that was about 140g. I know over feeding can be a big issue and I do not want to hurt the boas I am also moving them to a 2 week schedule now that they have eaten once for me. Also they are between 3.5-5 ft in length and was told about a year old.

so with all of the important key points my questions

I breed my own rats and prefer feeding f/t so with out measuring how big around each rat is aprox what gram weight (I weigh them before I freeze them) would you recommend I euthanize the rats and how often should I expect to move the feeding size up.

is there a girth range chart for the rats according to their weight

to me their age and size dont quite add up I would expect them to be a bit older at those lengths but who knows

Thank you all