Varied diet or "treats" for snakes?

[Bogertophis]

Back when I kept BPs, I had a house-full of snakes (no exaggeration) & raised rats, mice & hamsters. Since I always had feeders of all sizes & types, I did vary it
up sometimes, & & think for the most part that's beneficial (or at least more like what happens in nature). BPs LOVE hamsters, but unless you want yours to insist
on them from now on, offering these other items really is asking for trouble, at least with BPs. Now I wouldn't hesitate to do this with most rat snakes or bull/gopher
snakes...they aren't as finicky as BPs & do appear to enjoy some variety. (same for rattlesnakes they'll take variety in stride) BPs are challenging enough already.

I've not fed chicks but have often seen keepers mention that the snakes eating them tend to have more watery stools, so there's that too. It may also take some
getting used to, just like when you change the brand of dog-food you give your dog...snakes have enzymes that excel at digesting their usual diet & may take some
time to adjust.

Basically, I'd stick to their regular diets. Adding vitamins or other supplements should not be necessary unless you're breeding (maybe not even then) and
as long as the rodents are fed properly (coming from a reliable supplier...not someone just out to make a buck by feeding the cheapest foods possible.)