Pig manure is an excellent fertilizer for herbs, vegetables and seeds, but it has to be composted for over 5-6 months before added to soil. Purchasing 2 big compost bins per 1 pig is a good start. Apart from pigs manure, you can add grass cuttings, leaves, newspapers and vegetable kitchen wastes to the compost bin. As a rule of thumb, pig manure produced in fall can finally be added to soil during next spring.