Sheep plus broilers

Just going through some photos that my mom sent during her visit in October.  The one below features some lovely green grass, chickens, and sheep.  Most folks may feel warm and fuzzy looking at this shot, but it makes me a bit irritated as it reminded me of some low-shocking electric fence that failed to keep the sheep out of the broiler pasture that day.  Typically, we separate the sheep from the broilers using a few strands of polywire so the sheep do not raid the chicken grain. What we were going for is using the sheep to graze the pasture down to a low level so the chickens could follow the sheep and scratch through the sheep manure plus not be soaked through with taller grass and its associated dew.