I have a flock of about 30 birds I bought from MM about 14 weeks ago. They are currently in a chicken yard about 50ft X 50ft that includes a coop. In the past I have waited untill my chickens have started laying before I let them freerange. However, I'm thinking of cutting a door in the chicken yard so they can get out if they want and make use of all the green grass and bugs that are available. what do you think about letting them out this early?