Oh wow I just read that article and I think your right. I breed my own rats and I know the article said that the Zuckers get the high fat % when they're older but I think my baby may have gotten too much fat from the baby rats. Most of the ones I was giving her before were just born and had only taken maybe one nursing if anything from mom and only had what little fat they were born with. The feedings before she got fat I had just moved her up to to a two to three day old pink and so those pinks had time to get more fat from mom. Her last pooh was dark and sticky looking as well.
Maybe the Vet can tell me something to give her so I don't loose her like the guy lost his.