I am sure it has been talked about a lot, Worming Questions

[Joe.G]

Can they get black head in the winter? Here the ground is froze solid at the moment, Does that kill it off or at least stop it from spreading?

 

[casportpony]

Barn lime shouldn't bother as it's much weaker than the 'normal' lawn/garden lime.  I wouldn't hesitate to use it at all.  I add it to the chicken's dusting box and have even used it in the ducks/goose outside pen without any issues at all.  Try it...you'll like it, lol.

On all seven acres?

 

[Haunted55]

On all seven acres?

I have 36, lol, all I do is what I know they travel. The rest of it, let it go. If they start going farther afield, it will give them a chance to build up an immunity to it. Do what you can and expand when you can.

 

[casportpony]

I have 36, lol, all I do is what I know they travel.  The rest of it, let it go.  If they start going farther afield, it will give them a chance to build up an immunity to it.  Do what you can and expand when you can.   

Oh how I wish we had more land, and trees, too.