This is a loose mash feed suitable for all poultry over 6 weeks old. It is formulated with non-GMO ingredients and all the vitamins, minerals, and probiotics necessary to keep your flock happy and healthy. This Mixed Flock Feed has grit added, but for optimal digestion we recommend offering grit free choice as well, in a size suitable for your variety of poultry. For laying hens or laying ducks, offer free choice oyster shell as well. | Eden Feeds Non GMO 18% All Flock Mash Poultry Feed | Size 40 lbs