Quick afterthought about tube-feeding snakes, for anyone thinking of trying this: just before you insert the tube (catheter) into the snake, make sure the tubing is filled with the liquid all the way to the tip (ready to drip)- you want to avoid putting air bubbles into the snake, that won't help them digest.
It's also best for the snake to be lying flat when you tube-feed: I like to do this in the
bathtub, with a towel they can lay on. That way drips are easy to clean up, but be sure to keep their body level with their head elevated as you put them back into their own enclosure.
Remember, never force the tubing: a snake will resist, of course, & occasionally their teeth can catch on the tubing, but otherwise the tubing should slide in easily; be gentle & when you feel the tubing stop, don't push any more (you're at the top of the stomach, where you need to be)...just dispense the liquid food fairly quickly, slide the tubing back out and let the snake rest. Some will open their mouth to try to regurgitate, because pulling the tube out just feels weird...I massage their neck gently, & they usually relax & keep it all down.
And for anyone just joining this (?), I've had lots of success using Gerbers (baby food)
"2nd foods- Chicken & gravy". It's very easy for a snake to digest & doesn't have sugar in it: it's nothing but ground chicken, water, & corn starch. (you'd be surprised what some other brands of baby food put in theirs!) To tube feed, you have to add enough water so it goes thru the tubing easily (test first & NOT on the snake!) & I often put a drop of olive oil in the liquid too, to make it "slippery". You can add dissolved vitamins, minerals or meds as needed also.
If you ask many vets about tube-feeding, they often recommend products like Nutrical, which is a high calorie supplement paste designed for dogs/cats...don't go there, use Gerbers. Nutrical (& similar products) contain a lot of sugars, and the main ingredient is corn syrup! Not exactly a natural food for a snake... (you can google the ingredients for yourself)