As the title says really, our 3 kune kunes haven't been able to keep on top of all the grass growth. About half of the field is completely overgrown to about waist height and has gone to seed. My fussy pigs won't touch it, they choose to eat only the short patches. My OH is desperate to attack it with the flail mower (I think mostly because he is looking for any excuse to play with his newly repaired toy). Would they be ok to stay in the field once this is done, and if not, how long until they could go back in?