| [dominant characteristics of helminth parasitism in cattle in ituri (haut-zaire). i. the helminth fauna]. | the identification of cattle helminths in ituri was carried out by post mortem examinations in slaughterhouses and tracer calves. the thirty diagnosed species were typical of wet tropical areas of africa. the presence of dictyocaulus viviparus, ostertagia ostertagi and haemonchus similis and the absence of echinococcus granulosus constituted the original features of this inventory. | 1990 | 2263748 |
| efficacy of ivermectin against the abomasal nematode mecistocirrus digitatus in naturally infected zebu calves. | anthelmintic efficacy of ivermectin against mecistocirrus digitatus was evaluated in 10 naturally infected zebu calves. group 1 (n = 5) was not treated, and group 2 (n = 5) was treated sc with 200 micrograms of ivermectin/kg of body weight. calves were euthanatized 14 or 15 days after treatment. there was 100% overall reduction of m digitatus in treated calves, which was significant (p = 0.0079) compared with reduction in controls. cooperia punctata, haemonchus similis, and trichostrongylus axei ... | 1987 | 3434907 |
| [morphology of vulvar processes of haemonchus similis travasses, 1914 in bos indicus l., in brazil (nematoda, trichostrongylidae)]. | | 1972 | 4680447 |
| bilateral, perivulval cuticular pores in trichostrongylid nematodes. | a new hypodermal gland was discovered in female nematodes of the family trichostrongylidae. because the new structure appears to be associated with the vulva, it was named the perivulval pore. it is similar, based on light and scanning electron microscopy, to phasmids that are located laterally on the tails of nematodes of the class secernentea. like phasmids, perivulval pores are paired and bilateral, with cuticular ducts to the surface in the areas of the lateral chords. they are located sligh ... | 1995 | 7623208 |
| purification and characterization of surface-associated proteins from adult haemonchus contortus. | extrinsic radioiodination experiments have shown that male and female adults of haemonchus contortus (bpl strain) express a stage-specific set of surface-associated proteins with apparent molecular mass values of 30, 58, 81, and 143 kda. a quantitatively different pattern of iodinated surface proteins is expressed by adults of the ppr strain of h. contortus, whereas the pattern of iodinated proteins expressed by haemonchus similis is qualitatively distinct (38, 68, and 121 kda). the 58-, 81-, an ... | 1994 | 7931909 |
| efficacy of doramectin against field nematode infections of cattle in latin america. | two studies were conducted, one in argentina and one in brazil, to evaluate the therapeutic efficacy of doramectin administered subcutaneously at a dose rate of 200 micrograms kg-1 (1 ml per 50 kg) to cattle harboring mixed field infections of gastrointestinal nematodes. in each trial, 20 heifers were randomly allocated to a control or treated group of ten animals each, on the basis of fecal egg counts. animals in the treated and control groups received an injection of doramectin or saline in th ... | 1993 | 8236736 |
| cloning and characterization of ribosomal rna genes from three species of haemonchus (nematoda: trichostrongyloidea) and identification of pcr primers for rapid differentiation. | genomic dnas prepared from adult worms of haemonchus contortus, haemonchus placei, and haemonchus similis were used to clone and map complete ribosomal rna gene repeats from each species. the lengths of the repeating units were estimated at 7.2, 7.2, and 7.4 kb, respectively, with a second and distinct repeat 6.9 kb in length identified from h. contortus only. restriction enzyme recognition sites within all ribosomal rna genes were fully conserved except for the loss of a sali site within the la ... | 1994 | 8299758 |
| new morphological characters for identifying individual specimens of haemonchus spp. (nematoda: trichostrongyloidea) and a key to species in ruminants of north america. | 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 can be observed at 400x in temporary mounts on glass slides. the synlophe can be studied in cleared pr ... | 1994 | 8308643 |
| seasonal infection pattern of gastrointestinal nematodes of beef cattle in minas gerais state--brazil. | tracer calves were used to assess the seasonality of infections of gastrointestinal parasites in beef cattle extensively raised at a farm in the state of minas gerais, brazil. tracer calves acquired infections during all months of the year, however, highest worm burdens were observed in the rainy season. the following nematode species were recovered from tracer calves: cooperia punctata, c. spatulata, c. pectinata, haemonchus similis, h. placei, oesophagostomum radiatum, trichostrongylus colubri ... | 1998 | 9561708 |
| host specificity of haemonchus spp. for domestic ruminants in the savanna in northern ivory coast. | three haemonchus species (haemonchus contortus, haemonchus placei and haemonchus similis) live in sympatry in the savanna of north côte d'ivoire. four domestic ruminant hosts (zebu-cattle, taurine-cattle, sheep and goats) share the same pastures throughout the year. our post-mortem data imply that a haemonchus spp. circulation exists among the different hosts species in the savanna of north côte d'ivoire. under field conditions, mixed congeneric infections were the rule except in sheep where mon ... | 2003 | 14519319 |
| vaccination of grazing calves with antigens from the intestinal membranes of haemonchus contortus: effects against natural challenge with haemonchus placei and haemonchus similis. | a vaccine containing integral membrane glycoproteins from the intestine of haemonchus contortus was evaluated in three groups of eight 5 months old grazing calves, naturally infected by haemonchus similis, haemonchus placei and other gastrointestinal nematodes. vaccinated calves received 5 or 50μg of the antigen and 1mg of saponin adjuvant, while the controls received adjuvant alone, initially three times, 3 weeks apart and then four more times at 6 weeks intervals. three weeks after the last im ... | 2014 | 24960373 |