Phylogenetic analysis of 25 morphological characters among the 12 species of Haemonchus resulted in 1 most parsimonious tree (60 steps; consistency index = 0.67, retention index = 0.80). Monophyly for Haemonchus was diagnosed by 3 unequivocal synapomorphies, including the asymmetric origin of the dorsal ray, relative size of the ventral rays, and the presence of a barb on each spicule tip. Spec...

The large stomach worms Haemonchus contortus, Haemonchus placei, and Haemonchus similis are important pathogens of cattle and sheep. This paper describes characteristics of surface cuticular ridges (synlophe), which for the first time provide morphological criteria for identifying individual adult specimens of either sex. The diagnostic patterns of the synlophe on the anterior half of specimens...

Ten female lambs of 7-month-old were divided into two equal groups and raised under a helminth-free conditions. Animals in group 1 were immunized two times by whole gut homogenate (WGH) of Haemonchus contortus emulsified in Freund’s adjuvant. In group 2 (control), animals were injected by phosphate buffered saline emulsified in the same adjuvant. Animals were challenged by 10000 third-stage lar...

It was evaluated the anthelmintic activity of Agave sisalana (sisal) juice against gastrointestinal nematodes and its potential toxic effects in goats. In vitro tests showed more than 95% reduction in larval counts of the genus Haemonchus spp. at concentrations between 86.5 and 146.3 mg.mL(-1). In vivo the percent reduction of larvae of the fourth (L4) and fifth (L5) stages of Haemonchus, Oesop...

REINECKE, R. K. Studies on Haemonchus contortus l. The influence of previous exposure to Trichostrongylus axei on infestation with H . cantor/us. Onderstepoort J. vet. Res. 41 (4) , 213216 (1974) . A group of Merino sheep, aged 67 months was infested orally with 50 000 infective larvae of Trichostrongylus axei. This group and a control group were challenged 9092 days later with 50 000 infective...

A study was conducted regarding the level of burden of gastrointestinal Parasites in goat slaughtered for human consumption in Shillong, Meghalaya during June,2001 to June,2006. A total of 250 gastrointestinal tract were examined for adult parasites. The intensity of parasitic infection was recorded maximum in rainy season and least during winter. The parasite recorded was O. venulosum, O. colu...

Aim: To study the prevalence of gastrointestinal parasites in sheep and goats of Mathura region. Materials and Methods: A total of 240 faecal samples collected from three different farms were examined by direct smear, Willi's floatation and sedimentation techniques. Quantitative examination was done by McMaster's technique. Results: Out of 240 samples processed 165 samples were found positive f...

Water was evaporated from infective Haemonchus contortus larvae suspended in tap, distilled and triple-distilled water, and the nematodes were then exposed to 50% and 75% relative humidity (RH) at 20, 30, 40, and 50 C. Sample groups were rehydrated 4 hr daily in similar quality water, observed for motility, then returned to the same RH and temperature and re-evaporated. This was continued until...

The effects of tannins on adult populations of Haemonchus contortus, Trichostrongylus colubriformis and Teladorsagia circumcincta in goats are characterised mainly by a decrease in egg excretion without any significant changes in worm number. In contrast, the impact of tannins on T. colubriformis or T. circumcincta third-stage larvae (L3) is associated with a significant reduction in worm estab...

A strain of Haemonchus contortus from the Pietermaritzburg district of Natal was found to be resistant to levamisole (geometric mean efficacy 76.5%), morantel (41.9%), the benzimidazoles (oxfendazole: 33.7%) and rafoxanide (82.0%), but apparently fully susceptible to closantel and disophenol. In the case of ivermectin, a mean of 5.2% of the H. contortus was not removed at a dosage of 200 microg...