There are times when you need to add to the chickens feed diet, like for winter, for disease or for other health reasons. Can the diet be modified to improve egg laying or is this a chicken limitation? For instance, a diet of 1 part each of scratch, laying crumble, and turkey grow has been rumoured to increase egg laying. Personally I think it amazing any chicken can produce 300 eggs a year, 500 would be miraculous. Can it be done?