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The objective of the trial was to compare three different drugs for the strategic treatments of milk-fed lambs concerning their increase of weight. The animals were treated on June 8, 2000. Bodyweights and egg excretion of 58 lambs in total were examined until July 25, 2000. The gastrointestinal worm infection was quite low. Nevertheless the results of the trial showed that the single strategic treatment of lambs on pasture against intestinal worm infections is economically acceptable and necessary.The parenterale application of doramectin, the oral treatment with moxidectin as well as the short acting albendazole have been examined.The anthelmintics were administered in exact doses as recommended by the manufacturers. Doramectin acted for approx. 6 weeks. Moxidectin was more than 98% effective at the end of the trial. The treatment interval could have been extended to 8 weeks if Nematodirus spp. had not been diagnosed. The protective effect against this parasite is exhausted after 6 weeks. Doramectin has a longer efficacy against Nematodirus spp. than Moxidectin. Albendazole should be given every three weeks over the complete grazing period in order to achieve the same protective effect.The various treatment regimes do not have a statistically verified different influence on the body mass development. The reason is the very reduced parasite burden of the lambs. Since the lambs had reached their "sales weight" on July 25, 2000 the increase of pasture infection did not result in a reduction of body mass development at that time.The lambs of all three treatment groups had an above average increase in weight. However, only an indirect comparison with the remaining lambs, kept under the same conditions on the neighbour pastures, was possible.