The prevalence of helminthiasis was found to be 15.2 % in buffaloes. Out of 500 samples examined, 9.2 % and 5.4 % were infected with nematodes and trematodes respectively. Mixed infection was observed in 0.6 %. The chief helminths identified were: Toxocara vitulorum (3.6 %), Fasciola gigantica (3.2 %) Oesophagostomum radiatum (3.0 %) Strongyloides papillosus (2.4 %), Fasciola hepatica (2.2 %), ...

The peri-parturient period is crucial for controlling worms as the acquired immunity of ewes is disrupted, resulting in an increase in faecal worm egg counts. Two hypotheses were tested in this experiment - that ewes bred for worm resistance would have lower faecal worm egg counts than unselected control ewes, during late pregnancy and lactation, under similar but separate grazing areas; and al...

Teladorsagia circumcincta is a polygamous nematode that exhibits morphological polymorphism. Sex ratio is typically female biased and the male nematodes occur in association with the genetically similar, minor morphotypes Teladorsagia davtiani and Teladorsagia trifurcata. In experimental infections, sex ratio (proportion male) and the proportion of minor male morphs observed have been shown to ...

BAKER, M. R., and R. C. ANDERSON. 1975. Seasonal changes in abomasal worms (Ostertagia spp.) in white-tailed deer (Odocoileus virginianus) at Long Point, Ontario. Can. J. Zool. 53: 87-96. Three species of nematodes were recovered from the abomasa of white-tailed deer (Odocoileus virginianus) collected at Long Point, Ontario, from September 1972 to August 1973. Ostrrtagia odocoilei was recovered...

This study used selected lambs that varied in their resistance to the gastrointestinal parasite Teladorsagia circumcincta. Infection over 12 weeks identified susceptible (high adult worm count, AWC; high fecal egg count, FEC; low body weight, BW; low IgA) and resistant sheep (no/low AWC and FEC, high BW and high IgA). Resistance is mediated largely by a Th2 response and IgA and IgE antibodies, ...

The use of tanniferous plants or tannins represents one alternative approach to the control of gastrointestinal parasites in ruminants but most data have been obtained in sheep. The current study was therefore performed in goats with two objectives: firstly, to investigate the effects of condensed tannins (CT) on adult populations of Trichostrongylus colubriformis and Teladorsagia circumcincta;...

Anthelmintic resistance is a major problem for the control of parasitic nematodes of livestock and of growing concern for human parasite control. However, there is little understanding of how resistance arises and spreads or of the "genetic signature" of selection for this group of important pathogens. We have investigated these questions in the system for which anthelmintic resistance is most ...

Substantial debate exists on whether the immune response between sheep resistant and susceptible to gastrointestinal nematodes can be differentiated into a Th1 and Th2 phenotype. The present study addresses the hypothesis that variation in resistance to Teladorsagia circumcincta between DRB1*1101 (associated with reduced faecal egg count and worm burden) carriers and non-carriers is due to a di...