a lot of the home bred produce tends to be bigger in terms of weight and growth per age (and overall quality IMO) than the mass produced rodents for the frozen market.. this may account for the difference in the sizes..
i can't remember which frozen food supplier this pic actually comes from, although i have to say i also have it saved and loaded to photobucket and have also posted it here and there at times.. tis a very useful chart.. but it will be their average weight/size per category as supplied by mass production
(mass in relation to the average home feeder/breeder that is)
much of the uk's frozen rodent supply is actually sourced from outside the UK these days, with the major suppliers shipping in from western europe, increasingly eastern europe, but also as far away as the USA.
the rodent farms in the uk found themselves under increasing pressure from both legislation and costs, and so many uk rodent farms quit over the last few years, one business in the northwest i remember advertising for a buyer for some 18 months, i think without result.
its why you find a lot of people looked to breeding their own, personally i find the difference a huge one.. between what i can home rear.. and what i can buy in.. its a bit like the difference between raising your own free range chicken dinners.. to buying the production unit farmed chicken from tescos.. (which i have also done )
mass production rodent units are the equivilent to battery farmed chicken in many ways.. cheap, cheerful.. not as good as you could produce yourself..but always available.. they have a market thats for sure.
anyway.. i also agree.. sticky this! its a very useful chart, tho it might be an idea to add a credit to the site owner, should someone remember who they are!
this is another one, for rats and rabbits, i found whilst looking
for those looking to move between mouse and rat.. or rat and rabbit on the larger snakes, this is another useful link for seeing what in mouse terms equals aht in rat terms and so on for rats to rabbits