Difference of interest to me involves how the sheep and goats forage. Sheep graze, targeting ground level grasses that can be consumed nearly to the ground. Goats browse more, targeting forbes that are often out of direct reach for chickens. Both impacting the foraging options left for chickens. Chickens eat plants as well and seem partial to eating regrowth that occurs on plants that have recently been trimmed back. Sheep tend to leave more forbs that provide cover and locations for insect prey to collect.
Both species provide the feces that can provide resources that other prey for chickens benefit from. Sheep also grind up even small seeds while goats appear to pass some seeds the chickens can pick out of the feces.
The foraging pressure needs to be taken into account. Too much foraging by any species can degrade value to others. Modest pressure can at times improve it.
My observations based on when sheep and goats are not provided feed and chickens get supplemented with a most scratch grains. My place of work maintains both sheep and goats. Grazing system there is intensive. With goats (Bore cross mostly), supplemental grain feeding is used with young animals being raised for slaughter. My chickens would invest a lot of time going after that feed in addition to foraging.
Both species provide the feces that can provide resources that other prey for chickens benefit from. Sheep also grind up even small seeds while goats appear to pass some seeds the chickens can pick out of the feces.
The foraging pressure needs to be taken into account. Too much foraging by any species can degrade value to others. Modest pressure can at times improve it.
My observations based on when sheep and goats are not provided feed and chickens get supplemented with a most scratch grains. My place of work maintains both sheep and goats. Grazing system there is intensive. With goats (Bore cross mostly), supplemental grain feeding is used with young animals being raised for slaughter. My chickens would invest a lot of time going after that feed in addition to foraging.