>>... a friend of mine told me that she had fed her snake mice and rats etc. Bred her own mice, and fed her snake a mouse and the snake died due to the health of the mouse or something ...
That is pure BUNK! Snakes feed on rodents, birds, other reptiles, all kinds of things. Those that live in the wild are no healthier than those bred in captivity. The health of the prey animal makes very little difference to its nutritional value, and the contents of the prey animal's stomach could only be toxic to the snake if they were toxic to the prey itself. There's no way, no way whatsoever, that eating an appropriately sized mouse killed that snake.
I'm constantly reading here about how importaant it is to feed the rodents properly balanced diets, to ensure that the snakes receive balanced diets. Even that allegation may not be correct. The composition of the prey's flesh, bones, and organs, will be almost exactly the same no matter how good or poor its diet may be. About the only thing that may vary, will be the fat level, and possibly to some extent the calcium level. The living body, no matter what the species, has a tendency to extract from the diet whatever components it requires, and to excrete any and all superfluous components as waste. Consequently, all mouse meat will be virtually the same, no matter how well a particular mouse was fed.
The main reason for feeding your rodents a well-balanced diet, is that it is more economical in the long run. Well-fed mice are more productive than improperly fed mice. So, you'll get more pinkies out of them if they're well-fed. So get yourself some mice and/or rats, and take good care of them. Your snake will do as well eating them as he'll do eating any din-din's that you may purchase from any other source.
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tricia