Not All Manure is Created Equal

The nutrient value of manures varies by animal. Chicken manure is considered to be the most beneficial for your garden, with an N-P-K (nitrogen - phosphorous - potassium) ratio of about 1.1–0.8–0.5. Compare that with cows at 0.6–0.2–0.5 and horse manure, 0.7–0.3–0.6. Of course, even within species, the quality of the manure will vary.