Why is the Gemara (Talmud) Chulin which talks about Ritual slaughter of animals not having to do with sacrifices in the Beis Hamikdash (temple) in the SEDER (order) of Kodshim which is talks about Temple sacrifices?
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Rambam (in the introduction to his Commentary on the Mishnah) says that it is because the Torah itself introduces the concept of slaughtering for nonsacred purposes immediately following the rules about sacrifices (Deut. 12:11, 15).
It may also be due to the fact that kosher slaughter is basically an optional mitzvah (you don't have to eat meat), except in the case of sacrifices - so the topic naturally fits here more than anywhere else.
I would add as an answer, that perhaps, as the Torah describes within the context of wandering in the desert, animal slaughter without the context of sacrifice should be looked down upon.
See Vayikra Chapter 17:
So in essence, I would answer that Chulin, really is Kodshin. There are some chasidic stories regarding the holy purpose raising an animal by eating it as well.