Whenever there is addtional feed, either forage or grain, fed there will be reduced pasture dry matter intake. Using a PMR has an advantage that it reduces the slug feeding effect. Concentrate is mixed with a forage thereby slowing down the rate of fermentation. The rumen pH is not as severely reduced because the fermentation rate is slowed. For the choice of forage to use in this PMR, I like corn silage.
Quality is usually uniform and cows like to eat corn silage.
The concentrate mixes well with corn silage and you may reduce grain feeding by one to two pounds. If you do not have a corn program on the farm you will have to choose another forage alternative. A hay or haylage fed will reduce intake of pasture. Because hay or haylage does not have the energy of corn silage, grain feeding cannot be reduced. Hay will provice more fiber and rumen stimulation than corn silage, thus giving it an advantage for early spring grazing when pasture fiber is low.