Is the difference really noticeable. As far as weight gain goes I hear that rats put on the weight, why is that and is it a lot more than mice? Also why do rats cost more, are they harder to breed. Are they more healthy? I'm almost out of my frozen mice and would like to get some opinions on if the difference is worth the money. Thanks BrianD OH yea and I like the old forum format better, this is to hard to look at.


