I got my information from talking to a Mazuri nutritionist. She recommended the 9F over the 6F because I was breeding rats and using them to feed to snakes. especially for ASF's since they are a slower growing rat, the extra fat will put on size faster. The 6F is a lower energy diet than the 9F. still a great diet. The 11F is actually the one I want but there is a 2 ton minimum order. She also said they are all for "rodents" including rats and mice. Neither of them is specific to rats or mice only. I pay $20 for a 50 pound bag of the 9F same as the 6F. that is a typo on the website picture...click on the 9F product details and it says 50 pound bag. if you want happy healthy rodents, give them some super worms or crickets once a week. Rats and mice are omnivores and all rodents will eat insects in the wild. they love to chase and hunt them...good mental exercise too
I have not spoken to a nutritionist but I'm pretty sure that extra fat will put on weight, not size.
Could you post or send me the phone number of the place you buy Mazuri from?