Alpacas forage through pastures picking grasses and herbs that will fill their nutrient needs. When eating, they simply mow the top off plant instead of pulling up the plants like sheep. As a result, plants will continue to grow.
Therefore, it is important to rotate animals between pastures year-round to allow for growth to occur and to keep parasite ingesting low. At the same time, pastures need to be examined for nutrients that they are lacking. Soil testing and fertilization should occur yearly in the Spring. Likewise, pastures should be reseeded, especially in bare spots, with appropriate grasses and herbs that are beneficial for the alpacas.