It is best to burn to ash any carnivore or unknown manure. If in doubt, burn it.
Right now I am in process of reducing the ash percentage of my garden soil by greatly increasing the total quantity with forest compost and feeding the soil with bone meal and fish emulsion. Ash can be too high a percentage too, so it is good to use, based on experience, well designed ash with well chosen ingredients that are burned. Plan your ashing. That probably can go as well with composting. I still think some things are best composted when partially burnt. You simply can't be sure if you have gotten the questionable things hot enough for long enough to kill the dangerous microorganisms when partially burnt. So, if not sure like that, best to get it red hot glowing burning all the way through first.