The cow are in a particular bad area as can be seen here. The soil can only support mostly moss and Yellow Hawk eye weed but there is a little Bunch Grass and surpassingly Hairy Vetch which is a legume and fixes nitrogen from the air to the soil.
As can be seen here these mossy areas tend to be on the hillsides. This is from erosion when the field was crop farmed many years ago. Notice it is green in the hollows the grass grows better here do to more hummus in the topsoil. I have been moving the cows three times a day through this area. I want to keep the herd impact the same so I have kept the paddock the same size but move it three times to compensate for the lack of forage.
The green to the right in this photo is where I started the rotation two weeks ago it is amazing how fast it has come back even though It was grazed completely down to the dirt as can be seen in on the left.
One thing I have noticed is that the cows eating behavior has changed, they eat every thing in sight even the plants they normally avoided when I gave them a bigger area to graze. Also there is more manure being dropped in this poorer area then last year do to the cows eating every thing down to the dirt not just eating the choice morsels and then going to a better area and dropping their manure and urine in this good spot.