Animal sacrifice was the historical norm in Heathenry. It served two purposes:
- Offering to the gods, clearly.
- Bringing community together.
Animal sacrifice performed by one person may fulfill an offering to the gods but it's impracticable. Even sacrificing a chicken requires two people: one to hold and dispatch it and one to hold the
blót bowl to catch the blood, the whole purpose.
Blót comes from the word meaning blood.
The second aspect of community is that the
goði or
gyðja (priest or priestess) offers the blood to the gods and blesses the community with it. The animal is cooked, a portion is offered to the gods usually by burning it. and the rest is eaten at a community feast.
It's usually a larger animal like a goat that's sacrificed. That's impractical if not downright illegal in areas not zoned for raising and slaughtering livestock. Unless one lives on a farm and/or regularly slaughters livestock for food and can do it humanely that's why a live sacrifice is impractical.
Moreover, unless the animal is dispatched swiftly and humanely, if it suffers because the person sacrificing it is inexperienced, it could be considered an offense to the gods.