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Ostertagia ostertagi

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https://www.readbyqxmd.com/read/27905269/climate-influences-assemblages-of-abomasal-nematodes-of-sheep-on-steppe-pastures-in-the-east-of-algeria
#1
I Zouyed, J Cabaret, B Bentounsi
It is a common view that assemblages of parasitic nematodes are influenced by climatic conditions; however, there are only a few articles available regarding those that infect farm animals. We investigated the relationship between climate variables and infection with abomasal trichostrongyles in 335 1-year-old rams grazed on steppe pastures in Eastern Algeria. Abomasa were collected from 12 local slaughterhouses located in four climatic areas (from humid to arid) and the worms extracted, identified and counted...
December 1, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27835769/efficacy-of-ivermectin-against-gastrointestinal-nematodes-of-cattle-in-denmark-evaluated-by-different-methods-for-analysis-of-faecal-egg-count-reduction
#2
Miguel Peña-Espinoza, Stig M Thamsborg, Matthew J Denwood, Markus Drag, Tina V Hansen, Vibeke F Jensen, Heidi L Enemark
The efficacy of ivermectin (IVM) against gastrointestinal nematodes in Danish cattle was assessed by faecal egg count reduction test (FECRT). Six cattle farms with history of clinical parasitism and avermectin use were included. On the day of treatment (Day 0), 20 naturally infected calves per farm (total n = 120) were stratified by initial faecal egg counts (FEC) and randomly allocated to a treatment group dosed with 0.2 mg IVM kg(-1) body weight s.c. (IVM; n = 10) or an untreated control group (CTL; n = 10)...
October 13, 2016: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/27809969/confirmation-of-ivermectin-resistance-in-ostertagia-ostertagi-in-cattle-in-new-zealand
#3
Tania S Waghorn, Chris M Miller, Dave M Leathwick
Six suspected cases of ivermectin resistance in Ostertagia spp. in cattle were investigated after routine anthelmintic efficacy testing on commercial farms. On four farms a comprehensive faecal egg count reduction test (FECRT) was undertaken using oral formulations of ivermectin (0.2mg/kg), albendazole (10mg/kg) and levamisole (7.5mg/kg) while on two farms only ivermectin was tested. The proportions of Ostertagia spp. in the untreated control and post-treatment larval cultures were used to apportion egg counts to genera and determine efficacy against this genus...
October 15, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/27809966/abomasal-mucosal-immune-responses-of-cattle-with-limited-or-continuous-exposure-to-pasture-borne-gastrointestinal-nematode-parasite-infection
#4
Wenbin Tuo, Lei Li, Yingjun Lv, Jose Carrillo, Dedra Brown, William C Davis, Jiuzhou Song, Dante Zarlenga, Zhengguo Xiao
It has been well documented that cattle raised on pasture are slow in weight gain when compared to those fed with grain. Inflammation in the digestive system commonly caused by pasture-transmitted gastrointestinal (GI) nematode parasites that could negatively impact feed conversion has never been compared in cattle raised with no pasture exposure (NPE, uninfected), limited pasture exposure (LPE, exposure until weaning), or continuous pasture exposure (CPE, life time exposure). In the present study, the abomasal mucosal immune responses and inflammation of LPE and CPE cattle were investigated...
October 15, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/27771256/climate-driven-longitudinal-trends-in-pasture-borne-helminth-infections-of-dairy-cattle
#5
Johannes Charlier, Aklilu H Ghebretinsae, Bruno Levecke, Els Ducheyne, Edwin Claerebout, Jozef Vercruysse
Helminth parasites of grazing ruminants are highly prevalent globally and impact negatively on animal productivity and food security. There is a growing concern that climate change increases helminth disease frequency and intensity. In Europe, these concerns stem from case reports and theoretical life cycle models assessing the effects of climate change scenarios on helminth epidemiology. We believe this study is the first to investigate climate-driven trends in helminth infections of cattle on a cohort of randomly selected farms...
December 2016: International Journal for Parasitology
https://www.readbyqxmd.com/read/27573532/a-stochastic-model-to-investigate-the-effects-of-control-strategies-on-calves-exposed-to-ostertagia-ostertagi
#6
Zoe Berk, Yan C S M Laurenson, Andrew B Forbes, Ilias Kyriazakis
Predicting the effectiveness of parasite control strategies requires accounting for the responses of individual hosts and the epidemiology of parasite supra- and infra-populations. The first objective was to develop a stochastic model that predicted the parasitological interactions within a group of first season grazing calves challenged by Ostertagia ostertagi, by considering phenotypic variation amongst the calves and variation in parasite infra-population. Model behaviour was assessed using variations in parasite supra-population and calf stocking rate...
November 2016: Parasitology
https://www.readbyqxmd.com/read/27523943/the-efficacy-and-plasma-profiles-of-abamectin-plus-levamisole-combination-anthelmintics-administered-as-oral-and-pour-on-formulations-to-cattle
#7
D M Leathwick, C M Miller, C W Sauermann, P M Candy, S Ganesh, K Fraser, T S Waghorn
In phase I, faecal egg count reduction tests (FECRT) were conducted on six commercial cattle farms to compare the performance of two pour-on and one oral combination anthelmintic. Groups of 12-15 calves were sampled for faecal nematode egg count (FEC) before treatment with either abamectin oral, levamisole oral, an abamectin+levamisole oral combination or one of two abamectin+levamisole combination pour-ons. Samples were collected again 14days after treatment to calculate the percentage reduction in FEC. The proportions of infective stage larvae (L3) in faecal cultures were used to apportion egg counts to, and calculate efficacy against, the main parasite genera...
August 30, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/27514906/a-simulation-model-to-investigate-interactions-between-first-season-grazing-calves-and-ostertagia-ostertagi
#8
Zoe Berk, Stephen C Bishop, Andrew B Forbes, Ilias Kyriazakis
A dynamic, deterministic model was developed to investigate the consequences of parasitism with Ostertagia ostertagi, the most prevalent and economically important gastrointestinal parasite of cattle in temperate regions. Interactions between host and parasite were considered to predict the level of parasitism and performance of an infected calf. Key model inputs included calf intrinsic growth rate, feed quality and mode and level of infection. The effects of these varied inputs were simulated on a daily basis for key parasitological (worm burden, total egg output and faecal egg count) and performance outputs (feed intake and bodyweight) over a 6 month grazing period...
August 15, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/27403891/host-protective-asp-based-vaccine-against-the-parasitic-nematode-ostertagia-ostertagi-triggers-nk-cell-activation-and-mixed-igg1-igg2-response
#9
Ana González-Hernández, Stefanie Van Coppernolle, Jimmy Borloo, Frederik Van Meulder, Oonagh Paerewijck, Iris Peelaers, Georges Leclercq, Edwin Claerebout, Peter Geldhof
The mucus-dwelling parasite Ostertagia ostertagi is one of the most important gastrointestinal nematodes in cattle. Our group has previously demonstrated the protective capacity of a vaccine against this parasite based on a native activation-associated secreted protein ASP1 (nASP) in combination with the saponin adjuvant QuilA. The aim of the current study was to analyse the effect of both antigen and adjuvant on the cellular and humoral vaccine-induced immune responses by comparing the native ASP to a recombinant version expressed in Pichia pastoris (pASP) and replacing QuilA by Al(OH)3...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27369576/explaining-variability-in-first-grazing-season-heifer-growth-combining-individually-measured-parasitological-and-clinical-indicators-with-exposure-to-gastrointestinal-nematode-infection-based-on-grazing-management-practice
#10
Aurélie Merlin, Alain Chauvin, Aurélien Madouasse, Sébastien Froger, Nathalie Bareille, Christophe Chartier
The objective of our study was to explain the variability of average daily weight gain (ADWG) due to gastrointestinal nematode (GIN) infection for 291 non treated first grazing season (FGS) heifers, from 12 independent groups in the western part of France, by combining parasitological and clinical indicators at individual level and grazing management indicators at group level. Parasitological indicators were faecal egg count (FEC), anti Ostertagia ostertagi antibody level (Ostertagia ODR), and pepsinogen level...
July 30, 2016: Veterinary Parasitology
https://www.readbyqxmd.com/read/27357701/the-level-of-embryonation-influences-detection-of-ostertagia-ostertagi-eggs-by-semi-quantitative-pcr
#11
Markus Drag, Johan Höglund, Peter Nejsum, Stig M Thamsborg, Heidi L Enemark
BACKGROUND: The Internal Transcribed Spacer 2 (ITS2) is a candidate diagnostic marker of the pathogenic cattle nematode Ostertagia ostertagi. The aims of this study were: (i) to document and quantify how the development of O. ostertagi eggs affects ITS2 copies under different storage conditions, and (ii) to suggest optimal storage conditions for faecal samples in a diagnostic pipeline that involves detection and semi-quantification by real-time semi-quantitative polymerase chain reaction (qPCR)...
2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27283323/anti-parasitic-activity-of-pelleted-sainfoin-onobrychis-viciifolia-against-ostertagia-ostertagi-and-cooperia-oncophora-in-calves
#12
Olivier Desrues, Miguel Peña-Espinoza, Tina V A Hansen, Heidi L Enemark, Stig M Thamsborg
BACKGROUND: Increasing anthelmintic-resistance in nematodes of ruminants emphasises the need for sustainable parasite control. Condensed tannin-containing legume forages such as sainfoin (Onobrychis viciifolia) have shown promising anthelmintic properties in small ruminants but this has never been explored in cattle. Therefore, our aim was to examine the efficacy of sainfoin against cattle nematodes in vivo. METHODS: Fifteen Jersey male calves (2-4 month-old) were allocated into two groups and fed isoproteic and isoenergetic diets mainly composed of sainfoin pellets (Group SF; n = 9, three pens) or concentrate and grass-clover hay (Group CO; n = 6, two pens)...
2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27173405/anthelmintic-effects-of-forage-chicory-cichorium-intybus-against-gastrointestinal-nematode-parasites-in-experimentally-infected-cattle
#13
Miguel Peña-Espinoza, Stig M Thamsborg, Olivier Desrues, Tina V A Hansen, Heidi L Enemark
Two experiments studied the effects of dietary chicory against gastrointestinal nematodes in cattle. In Experiment (Exp.) 1, stabled calves were fed chicory silage (CHI1; n = 9) or ryegrass/clover hay (CTL1; n = 6) with balanced protein/energy intakes between groups. After 16 days, all calves received 10 000 Ostertagia ostertagi and 66 000 Cooperia oncophora third-stage larvae (L3) [day (D) 0 post-infection (p.i.)]. In Exp. 2, calves were assigned to pure chicory (CHI2; n=10) or ryegrass/clover (CTL2; n = 10) pastures...
September 2016: Parasitology
https://www.readbyqxmd.com/read/27120066/sesquiterpene-lactone-containing-extracts-from-two-cultivars-of-forage-chicory-cichorium-intybus-show-distinctive-chemical-profiles-and-in%C3%A2-vitro-activity-against-ostertagia-ostertagi
#14
Miguel Peña-Espinoza, Ulrik Boas, Andrew R Williams, Stig M Thamsborg, Henrik T Simonsen, Heidi L Enemark
The study investigated direct anthelmintic effects of sesquiterpene lactones (SL)-containing extracts from forage chicory against free-living and parasitic stages of Ostertagia ostertagi. Freeze-dried leaves from chicory cultivars 'Spadona' and 'Puna II' were extracted using methanol/water. Total SL were further fractionated by solid-phase extraction and resulting extracts were characterised by high-performance liquid chromatography (HPLC). O. ostertagi eggs from faeces of mono-infected calves were hatched and L1 were used in a larval feeding inhibition assay (LFIA), while cultured L3 were used in a larval exsheathment inhibition assay (LEIA)...
December 2015: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/26888630/impact-of-chemical-structure-of-flavanol-monomers-and-condensed-tannins-on-in-vitro-anthelmintic-activity-against-bovine-nematodes
#15
Olivier Desrues, Christos Fryganas, Honorata M Ropiak, Irene Mueller-Harvey, Heidi L Enemark, Stig M Thamsborg
Plants containing condensed tannins (CT) may have potential to control gastrointestinal nematodes (GIN) of cattle. The aim was to investigate the anthelmintic activities of four flavan-3-ols, two galloyl derivatives and 14 purified CT fractions, and to define which structural features of CT determine the anti-parasitic effects against the main cattle nematodes. We used in vitro tests targeting L1 larvae (feeding inhibition assay) and adults (motility assay) of Ostertagia ostertagi and Cooperia oncophora. In the larval feeding inhibition assay, O...
April 2016: Parasitology
https://www.readbyqxmd.com/read/26814160/anthelmintic-resistance-in-gastrointestinal-nematodes-of-dairy-cattle-in-the-macalister-irrigation-district-of-victoria
#16
S L Bullen, D S Beggs, P D Mansell, D J Runciman, J Malmo, M C Playford, M F Pyman
OBJECTIVE: To report anthelmintic resistance in gastrointestinal nematode parasites of cattle on commercial dairy farms in the Macalister Irrigation District of Gippsland, Victoria. METHODS: Faecal egg count reduction tests (FECRTs) were used to assess anthelmintic resistance on 20 Macalister Irrigation District dairy farms between May 2013 and June 2014. All three currently available anthelmintic classes for cattle nematodes in Australia were tested. Faecal samples were collected 10-14 days post-treatment for individual faecal egg counts (FEC) and larval differentiation...
January 2016: Australian Veterinary Journal
https://www.readbyqxmd.com/read/26710767/-a-comparative-analysis-of-various-antigenic-proteins-found-in-haemonchus-contortus-a-review
#17
I R Tak, J S Dar, S A Dar, B A Ganai, M Z Chishti, F Ahmad
Many innovative researches on the development and introduction of recombinant vaccines against many economically important parasites were carried out in the 20th century. Research continues to hold promise with the development of immunological and molecular approaches for control of these parasites and in this regard it has already been seen that blood-sucking parasites such as Haemonchus contortus and Ostertagia ostertagi are susceptible to control by vaccines containing "novel" or "concealed" antigens. Haemonchus contortus is primarily pathogenic to sheep and its blood-feeding behaviour causes effects ranging from mild anaemia to mortality in young animals...
November 2015: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/26448902/anthelmintic-resistance-to-ivermectin-and-moxidectin-in-gastrointestinal-nematodes-of-cattle-in-europe
#18
RANDOMIZED CONTROLLED TRIAL
Thomas Geurden, Christophe Chartier, Jane Fanke, Antonio Frangipane di Regalbono, Donato Traversa, Georg von Samson-Himmelstjerna, Janina Demeler, Hima Bindu Vanimisetti, David J Bartram, Matthew J Denwood
Anthelmintic resistance has been increasingly reported in cattle worldwide over the last decade, although reports from Europe are more limited. The objective of the present study was to evaluate the efficacy of injectable formulations of ivermectin and moxidectin at 0.2 mg per kg bodyweight against naturally acquired gastro-intestinal nematodes in cattle. A total of 753 animals on 40 farms were enrolled in Germany (12 farms), the UK (10 farms), Italy (10 farms), and France (8 farms). Animals were selected based on pre-treatment faecal egg counts and were allocated to one of the two treatment groups...
December 2015: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/26298745/association-between-dictyocaulus-viviparus-status-and-milk-production-parameters-in-dutch-dairy-herds
#19
M Dank, M Holzhauer, A Veldhuis, K Frankena
The objective of this study was to estimate the association between Dictyocaulus viviparus bulk tank milk (BTM) test results and milk production and milk composition parameters in adult Dutch dairy cattle herds. Bulk tank milk samples were collected in August and November 2013, and ELISA tests were performed. Two hundred BTM positive (BTM+) and 200 BTM negative (BTM-) herds were selected based on their BTM test result of November 2013, obtained from a list of farms that participated in the Dutch GD Animal Health voluntary monitoring program for controlling nematode infections...
November 2015: Journal of Dairy Science
https://www.readbyqxmd.com/read/26130849/applying-a-kinetic-method-to-an-indirect-elisa-measuring-ostertagia-ostertagi-antibodies-in-milk
#20
Raphaël Vanderstichel, Ian Dohoo, Fred Markham
Indirect enzyme-linked immunosorbent assays (ELISAs) are frequently run as endpoint ELISAs (e-ELISAs). However, kinetic ELISAs (k-ELISAs) have certain advantages over e-ELISAs. The objective of this study was to understand the relationship between e-ELISA and k-ELISA results. Specifically, to determine whether it was possible to run both k-ELISA and e-ELISA on the same plate and establish an appropriate time interval for k-ELISA measurements. A normalization method for k-ELISA slopes (slope ratio) is proposed...
July 2015: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
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