Chicken muck is very 'strong' and will burn your crops if you dig it straight in, and even more so if you use it fresh as a mulch. I use straw as bedding for my poultry (shavings take too long to rot down) and make a separate muck heap with mine, sometimes adding grass clippings. I turn it once during rotting and don't use it until it is very well made. Some crops need compost rather than manure, and others benefit from the extra nutrients such as nitrogen in manure, hence the separate heaps for each.
One helper we had here insisted on using chicken manure which was not properly rotted down to dig in under the roots of tomatoes. You could tell when the roots reached the raw manure because the plant leaves started to curl in on themselves so badly that the crop was very poor.