Now why on earth would you need to de-beak a frozen/thawed day old chick? I hope to goodness its a frozen/thawed and not a live chick they're de-beaking. Such a cruel practice that's still around.
If a snake can digest mouse teeth, I think a beak would be easy. They're not as sharp as they look, and in day old chicks are still quite soft and pliable, I can't imagine any sort of damage occuring from one to be honest.
Chicks aren't that bad for nutritional value, probably not as good as an adult mouse. However I would think that the smelly, runny poos would be a detriment to their extensive use. I haven't ever gotten my adults to be interested in them, or I would offer them occasionally as a break from the all-rodent diet that they've been on.
From looking at a comparison of their nutritional content from RodentPro's website available here:
Nutritional Value of Whole Vertebrate Prey the difference between a day old chick and an adult mouse really doesn't seem that much different.
Adult Mouse - Nutritional Values
Protein: 55.8%
Fat: 23.6%
Ash (mineral content): 11.8%
Gross Energy Obtained: 5.25% kcal/g
Day-Old Chick - Nutritional Values
Protein: 64.9%
Fat: 22.4%
Ash (mineral content): 6.4%
Gross Energy Obtained: 5.80 kcal/g
So based on that, it looks like chicks have more protein which would cause the runnier and smellier poos. Close to the same amount of fat, and less mineral content because the chick's bones hadn't hardened yet when compared to a fully formed adult mouse.
There has been some speculation that feeding chicks in the diet of corn snakes may enhance the labial (throat area) yellowing of older individuals. Chickens have a pretty high carotene content and with the feed nowadays that enhances that for a more yellow yolk-composition in the eggs, I can imagine that it would color a cornsnake up pretty good. I hope to test out the theory at some point, if I can ever manage to convince my corns that chicks are tasty. :shrugs: