Pastures should be kept in a “vegetative” state or in other words it should be green and growing for animals to get the most out of the feed source. Throughout the growing season, pastures should be either grazed or clipped to prevent the plants from producing seed heads. As the plant matures it will produce a seed head. As this process occurs, the nutritive value of the plant decreases. Some plants such as orchardgrass will rapidly decrease in nutritive value to the point of becoming unacceptable to the animals.