What is the law in breaking bones of an animal (such as a chicken or fish, turkey etc.)? Am I allowed to or not, and what are the reasons for it?
There is no prohibition involved in breaking the bones of an animal after it has been slaughtered. The problem is that sometimes, upon finding broken bones, one must suspect that the bones were broken before the shechitah, and this can render the fowl (but not fish) a tereifah. The only exception is the Pesach offering, for which the Torah prohibits breaking bones.