Deworming too often also promotes resistance. Due to the increase in resistance when using dewormers, alternatives to combating parasites are being sought. In recent years, increased attention has been paid to secondary plant ingredients. The condensed tannins are said to have a direct effect on the parasites. In traditional traditions, certain plants are said to have immune-stimulating and worm-killing effects. In recent years, research has focused more attention on secondary plant ingredients. If you compare plant occurrences in an unfertilized meadow with those in a meadow that is normally managed today, you will find significantly more and different types of wild grasses and forbs in the poor meadow. In many cases they are well-known medicinal plants. As a result, ruminants today lack the plants and secondary ingredients that are important for their digestion. A supplementary feed available on the market consists of herbs and spices. The mixture is intended to increase the animals' general defenses and enable the animals to cope better with the parasites.