I am getting new hens after my pullets were eaten by a fox. I have leftover 16% finisher pellets, and then duck feed (but not pelleted or crumbles- grains mixed together instead by our local feed store) that are 16 or 17% (new, not moldly. Leftovers from last year.) layer rations or finisher. Can I feed these to my hens along with appropriate grit and oyster shell? They will be outside all day too (this time in an appropriate pen) to help compensate for the slightly readjusted diet.