In reindeer farming, "the Sami travel with their flocks (of reindeer) according to an established cycle"; the cycle makes sure "that the" [reindeer] can eat properly during the various [or different] seasons of the year. For example, the spring migration to summer pastures, which have a rich variety of grasses and herbs, takes place just before new calves are born in May. Summer is a time when the calves grow and the adult animals regain their strength following a long, hard winter".