thanks all
that's put it in a better prospective
was looking on another forum and buy the calculations i got from there was more like 20kgs a day didn't sound right that's why i asked
have only kept 6 chickens before so going up in numbers a bit

will be quite free range shed at night
and allowed to roam 14 acres as they please pigs in 2 acre wood
and the horses but they are used to chickens around one has had her back used as a perch on more than one occasion
they will also have the veg and fruit perches to wonder
any more advice appreciated