I have previously made fish emulsion to fertilize a small greywater garden; pretty much sealing fish waste (entrails, bones, skin) into oxygen-free plastic containers and leaving it for 6 months to a year, and using the diluted 'tea' as a fertilizer. I've just moved to a new island where fish waste is not that readily available, but there is a small slaughterhouse which primarily slaughters goats. Presumably the same process would still work using goat offal? Are there any other factors I need to consider?
Edit: I should specify that this won't be for foods which will be eaten.