During winter months I change feed so it is made to a large degree of large particulates that hold up better on snow. This is possible since flock is made up largely of mature birds. For layers, the formulated diet is applied as pellets which is supplemented with intact grains like corn, sunflower, oats and millet. Additionally I make certain they have access to edible plant materials (if need be hays). With such a mix of eats greater effort is made to ensure birds have all the grit they need for processing the tougher foods.