I mostly use cow manure and chook poo because it is easily available to me, but here are my opinions on manures.
Cow - well broken down because of the digestive action of the multiple stomachs meaing the nutrients are readily available for the plants to access, citrus trees seem to love straight cow poo dumped at their drip line as a fertiliser/mulch but beware that a lot of seeds will germinate from uncomposted cow poo. I try to soak mine for 3 months in an old bath full of water to make the seeds swell and burst to reduce germination rates.
Chook - very powerful stuff, using in too high concentrations can burn the plants so spread it out a bit.
Horse - don't digest grain or stems as well as cows so not as well broken down or nutrient rich, this means that a lot of undigested grains will sprout which can either be seen as weeds or free green manure if you wat to turn it over into the soil. Fibreous nature means it adds a lot of soil structure and acts as a mulch too. You can often get horse manure for free.
Sheep - Natural slow release fertiliser pellets, just spread on top if soil and let nature take its course, don't seem to produce at may weeds, I think because sheep realy grind every grain when the eat.
Human - Has to be well composted in a purpose built composting toilet for about a year before use to ensure all pathogens are dead.
http://milkwood.net/2010/11/23/the-most ... -the-west/http://milkwood.net/2011/04/18/compost- ... -the-bins/
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