Marshalls generally is not a good food.
It seems that everyone has a special opinion on what is good and what isn't. What they can afford vs what they can't. I have 3 ferrets and 2 cats, so I found a food that seemed to be good for both of the animals. Ended up getting the Wellness Core Original. It isn't the BEST, but it's in the recommended list, and I can feed it to all my critters and spend roughly 50$/month to feed them which is doable for us. It did make my cats litterbox stink to high heavens, though. But both of them seem healthier, and the ferrets like the food.
I think there's multiple people here that feed their ferrets zupreem, or mix it into another food. I used a food chart website that is old now. From that food chart it's not the worst, but there are still better options. I just googled and found this new image. It seems comparable to the old food chart but updated (because the foods occasionally change their formulas). It also has treats on their rated by their ingredients. Hope this helps a little.
http://acwn-designs.deviantart.com/art/Ferret-Food-Chart-359164566 EDIT: Also, I believe Raw diet is considered to be the best, but it is a lot more work than a kibble diet and there's more thought that needs to go into it. I don't feed mine this way, as two of them rejected it entirely multiple times. Perhaps someone else can weigh in on that - or there may be some older threads about it. I did not learn about that from this forum, but rather the first forum I was on. I think it was the holistic one.
I'm also going to include the old link to the food chart I used when I picked, because it does have off-links to why ferrets need certain things in their diet and why other things shouldn't be there. I found it very informative when I was researching if I wanted to get ferrets.
http://moredooks.herobo.com/search.php?chart=ferret It's also notable that the new list has less foods listed than the old one. If you choose to go by the old list I would highly recommend checking the ingredients and percentages versus an actual bag of the food to ensure it's still the same, since the list below was generated 2 years ago I believe.
<message edited by Seelen on Friday, October 10, 2014 11:40 AM>