trichostrongyloidea

..It is concluded that drought and isolation are likely to be the major factors accounting for the development of anthelmintic resistance in nematodes in the island flocks...

..The results of this trial indicate the potential use of this fungus as a broad spectrum anti-parasite agent for use in both goats and sheep...

..Furthermore there were also strong relationships between the peripheral eosinophilia with serum (P<0.01) and gastric mucus IgA activity (P<0.01). Moreover serum pepsinogen and the number of L4 at slaughter were related (P<0.01)...

..contortus as a generalist nematode and suggesting that parasite transmission between populations of domestic and wild ruminants normally occurs...

..No reactivity was observed against the adult extract. The 30-35 kDa antigen seemed to exist as a high molecular weight complex in L3 homogenate and was not susceptible to protease K treatment, suggesting it may be non-protein in nature...

..22 and 0.38 respectively. The genetic correlation was 0.87: the FEC recorded under natural or artificial infection appear to depend on the same genetic potential...

..0, 0.0 and 26.4 lpg, (percentage reduction after moxidectin administration 100%). It is concluded that treatment of small lungworm infestation of sheep can be effected by using moxidectin...

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..For both, hay and silage, an antiparasitic effect could be shown, offering promising perspectives for the use of conserved tanniferous fodder as a complementary control approach against GIN...

..The model will be used to demonstrate the advantage, in terms of delaying resistance development, of current guidelines for anthelmintic use and management practices for worm control in sheep...

..This is the first reported case of Haemonchus parasiting cattle showing simultaneous resistance to avermectins and benzimidazole type anthelmintics...

..Five out of 40 worms collected from the albendazole-treated sheep were BZ(RR) homozygotes, whereas the rest (35) were BZ(RS) heterozygotes. No BZ(SS) homozygote form was detected within this group...

..This method could find utility in studying the molecular epidemiology of BZ resistance in cattle parasites and for defining the variables that limit the development and spread of anthelmintic resistance in this host...

..contortus, with the F1 lambs being more like the BBs after the second dose. This difference was also found for T. colubriformis and, to a lesser extent, for T. circumcincta...

..Gene knockout technologies such as RNA interference have the potential to provide high throughput, rapid and inexpensive methods to define whether the protein product of a particular gene would be a suitable vaccine candidate...

..In addition, the animals must be given supplementary feeding during this period...

..They contribute to the spread of the faecal material on the pasture and allow the larval death as a consequence of drying...

..Anthelmintic treatment conferred significant weight gain advantages (p < 0.05) on treated calves. weaners and cows. The weight gains are discussed in relation to disease and nutrition...

..In addition, the study has shown that adequate parasite control may be achievable without the use of anthelmintics...

..This novel approach to parasite control would be of interest amongst both organic and conventional sheep farmers operating in mountain regions...

..The untreated calves had 1,330 and 848 adult worms, respectively, for the IVS and IVR infected animals...

..Our results support the view that low protein diets could influence immune function and as a result resistant genotypes do not show any superiority in comparison with susceptible ones...

..and Nematodirus spp. were observed in the slurry group. It was concluded that in our conditions the helminth risk was extremely low and was not a cause of restriction of the use of these biowastes...

..In summary, grazing CT forages reduced FEC, larval development and worm burden, and also appeared to enhance immune response. The CT-containing forage SL reduced gastro-intestinal parasite infections of Angora does and kids...

..A sensitive, rapid, highly reproducible and inexpensive technique for detecting resistance to benzimidazoles in a worm population has been developed...

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..circumcincta. However, the data support the view that increased globule leukocyte counts and plasma IgE anti-L3 antibody may be associated with nutritionally improved expression of immunity in periparturient ewes...

..These results suggest that this technique may provide an alternative in vitro to detect anthelmintic resistance...

..Oral dosing with moxidectin was effective in removing adult female burdens of ivermectin-resistant T. circumcincta, but the effect of the drug did not persist against the resistant helminth population...

..Further laboratory studies are needed to confirm the resistance status in the herds...

..Thus, it is clear that a peri-parturient rise in FEC exists in Creole goats. By controlling the intensity of this peri-parturient rise in FEC, herd health and productivity could be substantially improved...

..circumcincta and C. curticei. They also appear to represent the first record of macrocylic lactone (ML) resistance in C. curticei in sheep in New Zealand or elsewhere...

..There was a statistical interaction between the number of adults and IgA activity that moderated their combined effect...

..The results suggest elevated immune responses against T. circumcincta infections in growing lambs grazing on either sulla or chicory compared to those grazing on grass/clover, probably due to differences in forage nutritional values...

..The maximum reduction of 78.4% in eggs per gram of feces (EPG) was recorded on day 10 after treatment with 3 g/kg. Levamisole (7.5 mg/kg), a standard anthelmintic agent, exhibited 99.1% reduction in EPG...

..These effects may be one of the ways in which these forages may affect parasitic infections in grazing livestock...

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..contortus not only by mitigating parasite related health disturbances of the host but also by a sustained reduction of pasture contamination...

..During the second grazing season, the treatments indirectly depleted the proportions of T. c. trifurcata, probably due to the poor infectivity of this morph...

..circumcincta infections in lambs...

..The observed differences in plasma antioxidant capacity between sheep and goats may have important implications in terms of the comparative resilience of sheep and goats to parasite infection...

..Overall, there was a congruent relation between C. punctata antibodies and the cumulative exposure to the three different levels of trickle infections...

..Chi3L1 transcripts were found to be significantly upregulated in both the abomasum and gastric lymph nodes in response to T. circumcincta challenge of previously infected animals...

..There was no hint of benzimidazole resistance, and unequivocal evidence of ivermectin resistance was missing. In contrast, tetramisole resistance was detected on one sheep farm...

..48 +/- 0.16 and 0.43 +/- 0.17, respectively. Therefore, under defined circumstances, eosinophil concentrations may be a useful indicator of resistance to predominantly T. circumcincta infection...

..Single drug and single species resistance suggest that resistance is on its beginning and that measures for reducing the spread of resistance are of interest and should be promoted...

..It was concluded that under these conditions arrested development of Teladorsagia was a short-lived, immunologically mediated phenomenon which could be reversed by immuno-suppressing the sheep...

..Our results describe the involvement of both eosinophils and mucosal IgA in the regulation of C. oncophora expulsion and suggest the development of a Th2 effector immune response...

..A third putative species was found in the SGL line based exclusively on the ND4 gene. These findings suggest that T. circumcincta is a species complex and that further investigation is required on a wider geographic scale...

..As the use of macrocyclic lactones is increasing in this region, further investigation is needed for detecting resistance to the anthelmintic family compounds by the LFIA...

..in R. rupicapra. These results showed that the LSU rDNA gene sequences are useful indicators of genetic and species diversity in species of Dictyocaulus...

..This is illustrated particularly in the Trichostrongyloidea. The origins of the rodents from Southeast Asia down the Indonesian island chain are reflected in the ..

..eckerti and D. viviparus using either a PCR-linked hybridization assay or image analysis software to study the dimensions of the buccal capsule...

..However, the H. costellatum prevalence study in a single common vole population was not sufficient to fully describe and explain the nematode-host interactions...

..Bacteria were also found at some points of interaction between fungus and larval cuticle. Cuticle penetration by fungus hyphae occurred only 48 h after predation...

..However, the test should be further optimized, e.g. more isolates with different susceptibility to ivermectin and mixtures of species, in order to use the test in field conditions...

..C. 4.1.1.15) or succinic semialdehyde dehydrogenase (E.C. 1.2.1.24), the first and third enzymes of the GABA shunt, respectively, suggesting that the GABA shunt is not important in general metabolism in these species...

..Neither native, purified Tci-MIF nor recombinant Tci-MIF-1 dramatically influenced the in vitro migration of sheep monocytes...

..The discrepancy observed between the fungus efficacy in coprocultures and on pasture, which was also observed in several other studies deserves further research...

..circumcincta was performed in order to investigate whether they may be novel cross-specific targets...

..Therefore, the control of gastrointestinal nematode parasites in ewes in this area should aim at reducing the effects of this phenomenon through treatment of ewes about 2-3 weeks to lambing and during lactation...

..The present work validates and enlarges the original descriptions of both species and assigns the specimens from L. patersoni, recovered from the type locality and the type host species, as neotypes...

..circumcincta. The flexibility of synthesis of putrescine in H. contortus may make this pathway less useful as a target for parasite control than in T. circumcincta, in which only the ornithine decarboxylase pathway was detected...

..A massive invasion of the proventricular mucosa with L. douglassi was macroscopically and histologically detected at necropsy of the anemic birds...

..Tropomyosin was selected for further analysis. IgE activity against tropomyosin was moderately heritable and associated with decreased egg counts and with reduced body weight at the time of sampling...

..It may be related to different humidity and temperature requirements for the development of free living larvae of the two Dictyocaulus species...

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..The trickle infection of C. punctata affected P metabolism due to the decrease in P retained and live weight due to fall in feed intake...

..The molecular evolution of this gene family in parasitic nematodes has diversified the pre-protein and life-cycle expression patterns of TGF-beta homologues while conserving the structure of the active domain...

Although Nematodirus battus (Nematoda: Trichostrongyloidea) is an economically important and highly pathogenic parasite of sheep in the temperate regions, very little is known about the population dynamics of its free-living stages and ..

..All compounds were active against the caecal nematode T. sigmodontis although it was less sensitive than T. colubriformis. Haemonchus contortus was more sensitive than T. sigmodontis to all anthelmintics tested except thiabendazole...

..Although this is particularly important in regions that remain poorly known, such as Africa, the principle certainly applies more broadly...

..These data confirm, in their entirety, that lagomorphs may be considered as "relay" hosts in the evolution of the Trichostrongylina...

..The fact that 40% fewer larvae were given during the trickle infection regime in the four recent trials is offered as an explanation for this difference...

..ostertagi worms showed significantly lower levels in resistant worms compared with susceptible ones. Whether the down-regulation of this IVM target actually contributes to the resistance mechanism in these worms remains unclear...

..Numbers of Nematodirus seemed less affected. The present paper discusses the complexity of fungus-nematode interactions in dung pats under natural conditions...

..In both sexes, the carene disappears at the posterior end of the body...

..When the RS genotype had no selective advantage over the SS genotype, genetic drift almost always led to the loss of the R allele, except in the largest populations (average size = 2000 worms)...

..It may imply that pigs can play an important role in reducing transmission of cattle nematodes if the two species are grazed together or alternately...

..A quantitative positive relationship between worm counts and total serum IgE levels was observed. Based on the observed correlations, we propose a role for the humoral response against the maintenance of the infection in the gut...

..Whether this is due to interaction of the effects of the parasites or to correlation in underlying resistance mechanisms requires clarification...

..1 degrees C, and the air temperature varied between -19.6 and +14.9 degrees C. It was concluded that L(3)-stage larvae of L. douglassii probably have the ability to remain viable on pastures during winter in Sweden...

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..It may also be useful for monitoring the emergence of resistant alleles in nematode communities...

..Copper oxide needles may represent an alternative to conventional anthelmintics in the control of Haemonchus infection in some goat farms...

..e. metaphylaxis) if required...

..The coefficients of sedimentation estimated by sucrose density gradient ranged between 4.8 S and 7.8 S and corresponded to a monomeric hydrophilic form (G1). For T vitrinus, an amphiphilic form was suspected...

..This resulted in the generation of a protocol that can determine the percentage of O. ostertagi eggs within a mixed population of gastrointestinal nematode eggs. Results indicate a detection equivalent to 0.05 eggs...

..Only non-significant differences were seen in weight development and calf birth weights between the groups. Because of its only moderate insecticidal efficacy, moxidectin cannot be recommended as an endectocide in reindeer...

..6 kg greater (P<0.04) than that of GI. Vaccination titres against Brucella suggested non-specific depression of immunity, while higher Pep and Eo levels in second-year steers may have reflected hypersensitivity reactions...

..No differences were found between the fungus-treated and non-treated control pats. This indicated that the rate of degradation of faeces was not affected by the addition of the fungus...

..The seasonal pattern of infection observed in the present study indicates that it is possible to decrease the number of treatments to one per year, thus, reducing the possibility for the appearance of anthelmintic resistance...

..It has been identified that one of these strategies is to simply use summer/autumn saved pastures for young stock at turnout, which if grazed by young stock prior to this, could prove to be counter-productive...

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..The dorsal ray of H. mitchelli is bifurcated distally for 25-39% (32%) of its length and its stem is expanded proximally, but the dorsal ray of H. okapiae is bifurcated 37-50% (42%) and its stem is of uniform thickness...

..These results confirmed that targeted application of anthelmintics might represent a way to combine the control of trichostrongyles and the prevention of anthelmintic resistance...

..We concluded that nematodes modify host susceptibility to scrapie, but their role in the horizontal transmission of the disease was not demonstrated...

..The CET efficacies for the farm B isolate were 51% and 72% for LEV and IVM, respectively...

..In the case of Avian Influenza especially, controlling the infection in birds is a pre-emptive strategy for control in people. ..