Czynniki warunkujące występowanie nicieni (Nematoda) u świniowatych oraz sposoby zwalczania tych pasożytów
AbstractThe study was conducted to investigate the factors that determine the permanent presence of nematodes in pigs, with reference to the efficacy of anthelmintic treatment, as well as to identify the species of Strnngylida and record any changes that occur in the parasitic fauna of native suids (Suidae). A total of 2498 faecal samples of pigs from different age groups were analysed by a modified McMaster method to assess the level of nematode infection in pig herds of southern Poland. For each herd, larvoscopy was also performed. At the same time, 267 animals were sampled to assess the efficacy of anthelmintics used on the farms. Among them, 154 sows were evaluated by the faecal egg count reduction test (FECRT). Post-mortem, the digestive tracts of 21 adult pigs (originating from 12 herds) and 20 wild boars were sectioned and examined for the presence of nematodes. In addition, the small intestines of 40 slaughtered fatteners were washed through in order to analyse their contents for the presence of roundworms due to coprophagy. Faecal samples collected from all the sectioned animals were subjected to coproscopic examination. As revealed by coproscopy, nodular worms (Oesophagostomum spp.) and roundworm (Ascaris suum) were commonly present in pigs, although the herds and age groups distinctly differed in the infection level which also showed a noticeable seasonal variation. The occurrence of nodular worms was significantly (P < 0.01) positively correlated (r = 0.22) with that of A. suum. Such species as Trichuris suis, and especially Strongyloides ransomi, were observed only sporadically. Anthelmintic resistance (AR) in nodular worms was found (FECR test) to appear in three out of the four herds considered for assessment. The holders used to deworm sows with levamisole (two herds) or oxfendazole (one herd, with the documented presence of 0. quadrispinulatum). Post mortem, O. quadrispinulatum was differentiated from 0. dentaturn in nine out of fifteen pigs infected with Strongylida, and in nine out of the twelve herds studied. 0. quadrispinulatum was not found in wild boars, instead, Bourgelatia diducta, a species new to the European fauna, was recorded in five animals. Both domestic pigs and wild boars were free of Hyostrongylus rubidus. The results of the research clearly show that an adequate parasitological monitoring scheme is of vital importance both for herds and populations of animals. Because the nematodes occurring in the investigated pig herds exhibit anthelmintic resistance, the present study suggests some measures to be adopted to prevent its development. Besides, the work presents the actions that should be taken to protect native suids from the introduction of foreign parasites.
|Other language title versions||Factors determining the occurrence of nematodes (Nematoda) in suids and the ways of controlling thereof|
|Publisher||Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, MNiSW |
|Publishing place (Publisher address)||Kraków|
|Book series /Journal (in case of Journal special issue)||Zeszyty Naukowe Uniwersytetu Rolniczego im. Hugona Kołłątaja w Krakowie. Rozprawy, ISSN 1899-3486, (0 pkt)|
|Publication size in sheets||7|
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