Technically, you can make an organic nitrogen fertilizer tea out of any compostable "greens" (or nitrogen sources), including animal manures, food scraps, meats, weeds, herbs, etc.
However nothing is like a good compost tea. Only compost has a balance of healthy, safe, beneficial aerobic microbes, humus, and insoluble and soluble nutrients in it. Raw organic matter doesn't.
Using a manure tea was recommended back in the old days, even centuries ago. However today, with modern research and health concerns over E.Coli and other pathogens and toxins in many raw animal manures, I wouldn't recommend making any form of
raw manure teas today.
Aged or composted manures are different. They have the same balanced healthy microbes, humus, and nutrients as mature compost.
Today many soil experts, and aggressive backyard composters like myself, are experimenting with aerobic compost teas. These are teas that have been constantly aerated for 1-3 days with a cheap aquarium air pump. Aerobic compost teas can do things that even plain classic non-aerated compost teas or other high nitrogen teas can't do.
Non-aerated teas are basicly natural fertilizers. They mainly just feed plants. They have little or no beneficial aerobic microbes in them. (NOTE: Almost all the beneficial microbes and macrobes in the top 6-12" of organic topsoil are aerobic.)
True aerobic teas are powerful biostimulants. They feed and breed beneficial microbes, earthworms, and other soil biology in the soil, and even on plant foliages. These amazing creatures are responsible for all the soil/plant fertilization, disease control, and soil building in the garden.
Check this out for more info on the subject, my friend:
http://www.dirtdoctor.com/forum/viewtopic.php?t=1036
http://faq.gardenweb.com/faq/lists/orga ... 28156.html
Happy Gardening!