Cow manure it often sold as "steer manure" but is most often collected from dairy herds. Cow manure has been used for centuries and that has led to a belief that it is a good fertilizer as well as a soil amendment.
Steer manure is most valuable as a mulch and a soil amendment. It holds water well and maintains fertility for a long time. The nutrient value is low and should not be relied upon for the main source of nitrogen. The average nutrient content of cow manure is N 0.6% P 0.3% K 0.3%. There is also a full range of trace elements.
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How can I ensure proper nitrogen levels ?
Steer Manure Causes Hermmie traits. Your plants get all happy & gay when nuted with no-balls genes. Ease up....
If you bought the shit in bags, weed posion shouldn't be an issue. A LOT of Ranchers spray various "Broad-Leaf" insecticide on the hay fields, which contaminates the shit. If the bagged shit is sterilized, like some is (to kill weed seeds), the mirobes, good bacteria & fungi will be dead. So watch for that. To add good fungi, etc, & kill off the bad, tea made of wole ground cornmeal will help. See the Library on dirtdoctor.com, and for making kick ass tea, see Bruce Deuley.com.