For number 2

Thank the god/desses for their bounty & pour some of the blood back to the earth, maybe even leave an offering of a prime piece of flesh (maybe a bit of the heart).

You could even say something along the lines of "as the circle of life goes, we thank the gods and goddess for their bounty, thank you for the flesh of <insert animal>, we give this blood and this piece of flesh as gratitude of its nourishing powers"