| helminth and arthropod parasites of angora goats on irrigated kikuyu grass pastures in the eastern cape province. | angora goat kids and yearlings grazing irrigated kikuyu (pennisetum clandestinum) grass pastures in the eastern cape province, became heavily infected with teladorsagia circumcincta and trichostrongylus rugatus, leading to high mortality in both age groups. peak burdens of the former were recorded during march and may, and of the latter during may and june. larger numbers of the cestode moniezia expanza, occurred in the kids than in the yearlings. despite the stress of high helminth burdens, no ... | 1990 | 2286996 |
| overberg research projects. i. the epidemiology of parasitic nematodes in ewes, suckling lambs and weaners. | total differential warm counts were done on sheep slaughtered from 7 may 1987 to 19 may 1988 at boontjieskraal estate in the overberg, republic of south africa. it was found that winter lambs became infested with nematodirus spathiger at 5 to 7 weeks of age. at weaning in october 1987 this species was superseded by teladorsagia circumcincta and trichostrongylus rugatus. small numbers of trichuris skrjabini and oesophagostomum venulosum were also present. from july to october, 3rd and 4th stage l ... | 1989 | 2487725 |
| [benzimidazole resistant ostertagia circumcincta in angora goats]. | angora goat kids from the eastern cape province with natural infestations of ostertagia circumcincta, nematodirus spathiger, and trichostrongylus rugatus were treated with albendazole, fenbendazole or morantel citrate, while a fourth group remained an untreated control group. the benzimidazoles were less than or equal to 50% effective against o. circumcincta, and approximately 50% effective against possibly resistant fourth larval stage n. spathiger. to confirm the diagnosis of anthelmintic resi ... | 1989 | 2607534 |
| helminth parasites of grysbok, common duikers and angora and boer goats in the valley bushveld in the eastern cape province. | helminth parasites were collected from 13 grysbok, raphicerus melanotis, 12 common duikers, sylvicapra grimmia, 24 angora goats and 24 boer goats killed on a farm in valley bushveld in the eastern cape province. nematodes belonging to 9 species and a further 2 genera and cestodes belonging to 1 species and a further genus were recovered from the grysbok. of these, worms of the genus skrjabinema, trichostrongylus rugatus, trichostrongylus pietersei and nematodirus spathiger were the most prevalen ... | 1989 | 2812700 |
| common secondary structures for the second internal transcribed spacer pre-rrna of two subfamilies of trichostrongylid nematodes. | sequences of the second internal transcribed spacer ribosomal dna for the parasitic trichostrongylid nematodes trichostrongylus probolurus, trichostrongylus rugatus and camelostrongylus mentulatus were compared with previously published sequences for five other species within the genus trichostrongylus. the secondary structures of the second internal transcribed spacer pre-rrna for these nematodes were predicted using an energy minimisation method. the results indicate that a common secondary st ... | 1998 | 9846614 |
| helminth parasites of gemsbok (oryx gazella) in the klein karoo. | the number and species of helminth parasites from three gemsbok (oryx gazella) were recorded, and their faecal nematode egg counts and the level of pasture contamination determined. six nematode genera were recovered and four species identified, of which trichostrongylus rugatus was the most prevalent. other nematode species recovered were cooperia sp., agriostomum sp., haemonchus contortus, nematodirus spathiger and ostertagia ostertagi. none of the worms were present in all animals studied, an ... | 2006 | 17283732 |
| ovine nematodes in wild lagomorphs in australia and first record of trichostrongylus rugatus in free living lagomorphs. | gastrointestinal parasites are a major problem for sheep graziers and anthelmintic resistance has been reported worldwide. given that in experimental circumstances, sheep helminths are able to develop in rabbits and hares, and that hares are very mobile and sympatric with sheep in many regions of australia, free-living lagomorphs were investigated regarding carriage of ovine nematode parasites under field conditions. we performed specific worm counts in the gastrointestinal tracts of 88 rabbits ... | 2013 | 23890598 |
| parasites of south african wildlife. vi. helminths of blue duikers, cephalophus monticola, in natal. | the helminths of 3 blue duikers, cephalophus monticola, from 3 nature reserves in natal were collected, counted and identified. taenia hydatigena larvae, a race of cooperia rotundispiculum, gongylonema angistris, trichostrongylus falculatus and trichostrongylus rugatus appear to be new parasite records for blue duikers in south africa. | 1991 | 2052315 |
| efficacy of a combined oral formulation of derquantel-abamectin against the adult and larval stages of nematodes in sheep, including anthelmintic-resistant strains. | derquantel (dql), a semi-synthetic member of a novel anthelmintic class, the spiroindoles, in combination with abamectin (aba) [as the combination product startect(-«)] is a new entry for the treatment and control of parasites in sheep. the 19 studies reported herein were conducted in australia, new zealand, south africa and the united kingdom to demonstrate the efficacy of derquantel-abamectin (dql-aba) against a broad spectrum of gastrointestinal and respiratory nematodes of sheep, and to supp ... | 2011 | 21684691 |
| the relative contributions of t. colubriformis, t. vitrinus, t. axei and t. rugatus to sheep infected with trichostrongylus spp. on the northern tablelands of new south wales. | this survey was designed to determine the spatial and temporal distribution and the relative contributions of trichostrongylus colubriformis, trichostrongylus vitrinus, trichostrongylus axei and trichostrongylus rugatus to sheep infected with trichostrongylus spp. on the northern tablelands of nsw. thirty completed larval cultures were collected from a commercial parasitology laboratory servicing the northern tablelands of nsw between june and december 2007. cultures were selected at random from ... | 2009 | 19632782 |
| observations of the sheath extension of the third stage, infective larvae of trichostrongylus rugatus. | the length of the sheath extension of third stage (l(3)), infective larvae of trichostrongylus rugatus is reported. the total length and length of the sheath extension of l(3) recovered from the faeces of sheep originating from two localities in south australia were measured. the total length of larvae was 615-722 microm and the length of the sheath extension was 46-56 microm (mean 51.5). the larvae of t. rugatus comprised up to 72% of the larvae recovered. worm free sheep were infected with lar ... | 2004 | 15567044 |
| parasites of domestic and wild animals in south africa. xlii. helminths of sheep on four farms in the eastern cape province. | at monthly intervals for periods ranging from 9 to 25 consecutive months between three and four merino yearling-sheep and two merino lambs on three farms in eastern cape thornveld, and two dorper yearling-sheep on a farm in valley bushveld were slaughtered and examined for helminths. the merino sheep were infected with 15 nematode species, of which haemonchus contortus, nematodirus spathiger and trichostrongylus spp. were the most numerous, and with four cestode species. the dorper sheep were in ... | 2003 | 14621313 |
| a middle-repetitive dna sequence element in the sheep parasitic nematode, trichostrongylus colubriformis. | a novel repetitive dna sequence in the sheep parasitic nematode trichostrongylus colubriformis was cloned and sequenced. a 1.1 kb repetitive sequence (tc15) which hybridized with dna from t. colubriformis but not with dna from two other parasitic nematodes, haemonchus contortus and ostertagia circumcincta, or sheep was further characterized. southern blot analysis showed that the repeat hybridized to a range of fragments in restriction digested t. colubriformis dna and existed in multiple copy n ... | 1994 | 7970890 |
| development of villus atrophy in the small intestine of sheep infected with trichostrongylus rugatus. | pairs of sheep infected with 120 000 larvae of trichostrongylus rugatus were killed at intervals from 2 to 56 days after infection (dai). worms were located in tunnels in the epithelium of villi or upper intestinal crypts at all stages of development. villus atrophy developed progressively until 16 dai, when surface microtopography, characterised by subtotal villus atrophy, stabilised. most severe lesions were in the first 3 m of small intestine where the density of nematodes was highest. discon ... | 1983 | 6684827 |
| morphogenesis of trichostrongylus rugatus and distribution during development in sheep. | morphogenesis of trichostrongylus rugatus was examined in 16 sheep experimentally-infected with 120 000 third-stage larvae and killed 2, 4, 6, 8, 10, 12, 16 and 20 days later (dai). third stage larvae moulted between days 4 and 6, and fourth stage larvae moulted on day 10 after infection. four sheep first passed eggs in the faeces between days 16 and 18 after infection. rate of growth of larvae was constant between 2 and 10 dai followed by a period of rapid growth from 10 to 16 dai. major featur ... | 1983 | 6684826 |
| the effects on merino lambs of chronic infection with trichostrongylus rugatus. | four groups of six 5-month-old merino lambs were exposed to infection with 12,000 larvae of trichostrongylus rugatus per week and one group was killed at each of 3, 6, 9 and 12 weeks. numbers of adult worms increased in an approximately linear manner throughout the experiment; the percentage of larvae developing to adults remained between 35 and 25% throughout the course of the experiment. sub-total villus atrophy was evident in the anterior small intestine of each group of infected sheep and si ... | 1989 | 2773272 |