i have some pretty rookie questions but i need to know so here goes. Whats the difference between chicken feed and scratch feed, can i feed either or is scratch feed more like a treat to the chickens. Can i just throw scratch on the ground out in the run or in a feeder. What about feed vitamins are there any i should be using or is the feed fortified enough and as my flock gets closer to laying (about 4 more weeks) is there anything i need to be doing about feeding they now feed by free choice as often as they like. now there getting dumor 20% feed from tractor supply.