Not a Savage Party...

Leviticus 22:26 And the Lord spoke to Moses, saying, 27 “When an ox or sheep or goat is born, it shall remain seven days with its mother, and from the eighth day on it shall be acceptable as a food offering to the Lord. 28 But you shall not kill an ox or a sheep and her young in one day. 29 And when you sacrifice a sacrifice of thanksgiving to the Lord, you shall sacrifice it so that you may be accepted. 30 It shall be eaten on the same day; you shall leave none of it until morning: I am the Lord.

As we have seen repeatedly, life in Israel was to be far different than life had been in Egypt or in the land of Canaan they were inheriting.  Many of God's laws on purity had to do with making that distinction and with the sanctify of and respect for human life.  Pagan sacrifice and fertility rites often violated that. They were not worship like God is to be worshipped, but reckless and ruthless perversions involving abuse and disrespect.  When sacrifice was conducted in Israel the aftermath was to be a purity that prevailed.