Chicken manure

Chicken manure is a highly enriched fertilizer in terms of nitrogen, phosphorus, calcium, magnesium, sodium, and sulfur. Sheep manure is similar to chicken manure in terms of nitrogen, but richer in potassium. Chicken manure is rich in trace elements like zinc, copper, and manganese, and cow manure contains intermediate levels. In general, poultry, sheep, and cow manure are richer in nutrients, respectively, among the common organic fertilizers.
According to a comparative research study on chicken and cow manure in Europe, chicken manure is richer and more valuable than other organic fertilizers if processed.