posted 9 years ago
With low cost poly wire, step in or poly t-posts or other self insulated posts, a really good fencer and a little bit of work it is very easy to protect trees.
For a micro level, someone with less than 20 trees, I cut the top and bottom off of a plastic 55 gallon drum, split it down the side, attach woven wire fencing around it so it extends beyond the top a foot or so and is above the bottom 12-16", with the seam at the same place as the barrel cut, place this around the tree trunk, use some self tappers to screw it together after wrapping around the tree(leaving lots of space reconnecting at almost full barrel diameter) making sure not to touch tree tissue with the metal fence material, use a poly stake to fasten it so it doesn't tip over, and run a single poly line from the fence charger and connected to the top wire of the woven wire of each tree guard. A few intermittent poly posts or t-posts with a pvc pipe insulator slid over it to guide the wire through the trees and keep it above sheep height makes it easy to protect a small orchard. I often drill a set of holes an 1" below the end of a 10' stick of pvc pipe, slide the poly wire through it, and the slip the pvc pipe over top of a 4' t post that is slightly smaller than the inside diameter of the pvc pipe making a 10' tall "power pole".
The video above highlights tending grazing. Those sheep are eating windfall apples and fall flush cool season grasses and legumes that are high quality and darned palatable. Sheep are flash grazed for 3 hours, removed to a holding pen, flash grazed for 3 hours, and then night penned elsewhere. They are not left to their own all day, or placed there when trees are more palatable than the forage around them.
If rotating through pasture during periods of heavy sap flow, heavy fruiting with low hanging limbs, or during times of poor forage quality will lead to tree damage if trees are not protected with poly wire, electronet, etc. There are orchardists and viticulturalists running sheep through very large, very expensive conventional orchards and vineyards. Proper timing, pruning, trellising and fence management are key to success.