When you use manure, you have to be careful to avoid over-fertilization. Phosphorus is usually of greatest concern because it can pollute surface water. Other elements like copper or zinc may also be present in some manures. You need to monitor these elements to avoid very high levels of them in the soil. Avoid repeated annual applications of manure to the same field.
Manure is a good resource.
Used wisely, it can greatly boost the productivity of your soil. Used unwisely, it can pose great environmental risks. Always soil test your fields as the first step in putting together your manure plan. My child bites. First, give your immediate attention to the victim.