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Parasite invasions are one of the main diagnosed pathologies of European bison. Since the severity and parasite species composition varies depending on the season, parasitological monitoring and deworming of European bison and evaluation of its effectiveness is important in the breeding of European bison. For that reason, parasitological evaluation based on coproscopical methods of live animals was performed. Full parasitological examinations of the digestive system together with necropsies were performed post-mortally. The obtained data enabled the selection of a suitable deworming treatment. The results showed that the parasite species composition in the fenced European bison breeding center was similar to the situation observed in free ranging European bison. The invasion of a blood sucking nematode Ashworthius sidemi was confirmed in European bison closed breeding for the first time. None of the European bison showed any clinical symptoms caused by parasitic factors. The research proved that from the clinical point of view the deworming process is more crucial in the spring, because of increased intensity and extensiveness of invasions during this time and the possibility for the use of chemotherapeutics with a broader spectrum of treatment.
Relationship between faecal egg counts and haematological parameters: PCVs, peripheral eosinophil counts, total white blood cell counts (TWBCs) and white cells composition in blood of Polish Wrzosówka breed of sheep were estimated in 1995 and 1996. Hoggets were naturally infected with gastrointestinal nematodes. Anthelmintics were not used. Among Teladorsagia circumcincta, Cooperia spp., Chabertia ovina, Nematodirus spp. (mainly N. spathiger) two species: Trichostrongylus spp. and Haemonchus contortus dominated. High repeatability of EPGs, PVCs and peripheral eosinophil counts were observed over two grazing seasons. There were no significant changes in TWBCs, in percentage of lymphocytes and neutrophils in blood smears. Marked differences in percentage of eosinophils in blood smears were confirmed in peripheral eosinophil counts. Additionally, the eosinophil counts in most sampling data correlated negatively with EPGs. The lowest level of haematocrit correlated negatively with EPGs when the highest percentage of L3 H. contortus larvae were found in the faecal culture. The results reveal that EPGs, PVCs and peripheral eosinophil counts could be considered in terms of phenotypic markers for identification of Wrzosówka sheep with different level of acquired immunity to natural trichostrongylid infection.
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