Control by management

摘要: It is currently possible to reduce significantly the number of anthelmintic treatments required by grazing ruminants employing some relatively simple management procedures, enlightened knowledge epidemiology parasites in climatic region and production system question. Some examples these such as Michel dose move for nematode control cattle, strategic at times low larval availability sheep alternate cattle will be considered. While procedures can have a major impact on frequency treatment, they rarely commensurate effect reducing selection anthelmintic-resistant worms. Only systems that avoid use anthelmintics altogether there any certainty avoiding resistance. The nearest approaches this ideal goal are schemes rotational being tested tropical environments. Even if anthelmintic-free successful, worms still selected attributes may ultimately render ineffective. Examples propensity select reduced host specificity, or increased numbers parasite species able infect both species. Similarly, could subverted enhanced survival faster development from egg infective larva. Nevertheless, it hoped fundamental changes those presumably affect survival, specificity slower than