In Have a Exu book it is offering to Mulabo for destroying targetI think I get the question despite the spelling.
It depends on the ritual you want to perform. Can you give us more details on the ritual you are interested in? Though honestly I don't think that there is anything really that you would need to kill an animal for. And Blood magic requires some skill and patience to learn. Some people cannot do blood magic for one reason or anther and they can do just fine.
So my answer is, despite being blind: You don't need either to use your blood or to kill an animal.
You don‘t offer your own blood in macumba. When a blood sacrifice is asked it is usually that of an animal.In Have a Exu book it is offering to Mulabo for destroying target