I am fencing a little over 1/8 acre (6400 sq feet)of old hay meadow to free range some meat birds. From Bergs hatchery in Manitoba, I plan to get 15 of their Bergs Grazers. They are Cornish X size but grow a bit more slowly. I hope the plot will be well grazed by the birds by the end of the summer. If it was down to bare dirt by October so I could plant a graden next year, that would be great. Is 15 full sized non hybrid birds enough to graze that much land?