| parenterally administered gastrointestinal nematode infective larvae viable after more than 15 years in liquid nitrogen. | after cryopreservation for 13.3-15.8 years, the viability of the infective larvae (l3) of trichostrongylus axei, t. colubriformis, oesophagostomum columbianum, haemonchus contortus, ostertagia circumcincta, t. falculatus, nematodirus spathiger, chabertia ovina and dictyocaulus filaria was assessed in sheep, by being deposited at their predilection sites. d. filaria was, however, an exception, in that the l3 were injected into the jugular vein. the mean development of all the species was 22.8%, b ... | 2000 | 10714461 |
| characterization of chabertia ovina by isoenzyme gel electrophoresis: comparative study with oesophagostomum venulosum. | the glucose-6-phosphate dehydrogenase (g6pd, ec.1.1.1.49), glucose phosphate isomerase (gpi, ec.5.3.1.9), and malate dehydrogenase (mdh, ec.1.1.1.37) isoenzymatic patterns of chabertia ovina were determined by starch-gel electrophoresis. the g6pd and gpi isoenzymatic patterns were characterized by the existence of three phenotypes: (1) a single and slow anodic band, (2) a single and fast anodic band, and (3) a large spot matching its migration with bands 1 and 2. these three phenotypes may be ex ... | 1999 | 10540947 |
| efficacy of an ivermectin controlled-release capsule against nematode and arthropod endoparasites in sheep. | five controlled trials were conducted in germany or in the united kingdom, using 74 female sheep of merino or dorset horn breeds, to evaluate the efficacy of an ivermectin controlled-release capsule against naturally acquired or induced infections of gastrointestinal nematodes, lungworms and nasal bot larvae and against incoming infections with gastrointestinal and pulmonary nematodes. half of the animals were treated with one ivermectin controlled-release capsule that delivered ivermectin at th ... | 1998 | 9571756 |
| moisture and temperature requirements in faeces for the development of free-living stages of gastrointestinal nematodes of sheep, cattle and deer. | isolates from eight gastrointestinal nematode species parasitic in sheep, cattle and deer were maintained in sheep, to provide eggs in similar faecal environments and to compare temperature and moisture requirements for their development. faecal cultures were processed at different temperatures (for four species) and moisture contents (for the eight species). at 60% of faecal moisture content (fmc), maximal rates of development (expressed as l3/100 hatchable eggs estimated by an extraction techn ... | 1995 | 8583130 |
| irrigation, faecal water content and development rate of free-living stages of sheep trichostrongyles. | the effect of irrigation by flooding the pastures on the ability of the eggs of sheep trichostrongyles to develop into infective larvae (l3) was estimated in outdoor conditions by depositing parasitised faeces on plots, without irrigation or submerged, at different times and durations. the rates of development of teladorsagia circumcincta, trichostrongylus vitrinus and chabertia ovina were very low in spring and summer in dry plots but proportional to the duration of submersion in the irrigated ... | 1993 | 8220500 |
| [anthelmintic resistance in sheep nematodes in the netherlands]. | the prevalence of anthelmintic resistant nematodes in sheep was investigated in 1994 with a faecal egg count reduction test (fecrt) and an egg hatch assay (eha) on 71 farms in the netherlands. a benzimidazole (oxfendazole) was tested on 70 farms, ivermectin on 51 farms, and levamisole on 35 farms. based on the fecrt benzimidazole resistance was present on 56 farms, 2 were suspected, on 9 no resistance was observed, while 3 farms could not be tested due to a too low egg output before treatment. n ... | 1995 | 7900149 |
| [helminthic cenosis of does in regions of bulgaria]. | studies were carried out on the species composition of helminths as found in does in individual region of the rhodope and balkan mountains and in the northeast part of this country. a total of 28 helminth species were found, belonging to 8 families as follows: class trematoda--one family with one species; class cestoda--one family with one species; and class nematoda--6 families with 26 species. most widespread were the species chabertia ovina, with 82 per cent of infected animals; spiculopterag ... | 1987 | 3617480 |