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Ostertagia ostertagi

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https://www.readbyqxmd.com/read/28843682/herd-level-prevalence-of-selected-endemic-infectious-diseases-of-dairy-cows-in-great-britain
#1
Martina Velasova, Angela Damaso, Bhagyalakshmi Chengat Prakashbabu, Jenny Gibbons, Nick Wheelhouse, David Longbottom, Steven Van Winden, Martin Green, Javier Guitian
To implement appropriate and effective disease control programs at the national level, up-to-date and unbiased information on disease frequency is needed. The aim of this study was to estimate the prevalence of selected endemic infectious diseases in the population of dairy herds in Great Britain. Bulk milk tank (BMT) samples from 225 randomly selected dairy farms, stratified by region and herd size, were tested for antibodies against bovine viral diarrhea virus (BVDV), bovine herpesvirus type 1, Mycobacterium avium ssp...
August 23, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28807295/anthelmintic-effects-of-forage-chicory-cichorium-intybus-against-free-living-and-parasitic-stages-of-cooperia-oncophora
#2
Miguel Peña-Espinoza, Andrew R Williams, Stig M Thamsborg, Henrik T Simonsen, Heidi L Enemark
Chicory shows great promise as an anthelmintic forage for grazing ruminants that can reduce reliance on anti-parasitic drugs. Recently, we reported potent anthelmintic effects of chicory-based diets in infected cattle with significant reductions in worm burdens of the abomasal nematode Ostertagia ostertagi, whilst no apparent activity was observed against the small intestinal parasite Cooperia oncophora. To explore this discrepancy, we investigated direct anthelmintic effects of forage chicory against C. oncophora in vitro...
August 30, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28807276/establishment-rate-of-cattle-gastrointestinal-nematodes-in-farmed-red-deer-cervus-elaphus
#3
S J Ten Doesschate, W E Pomroy, D Tapia-Escárate, I Scott, P R Wilson
Red deer can be infected with some gastrointestinal nematodes (GIN) of cattle but it is unknown to what extent. An indoor study was conducted to determine the establishment rate of cattle GIN in young deer. Five young calves and 5 young red deer were used. They were effectively treated with anthelmintics when housed and then infected 2 weeks later. After four weeks they were killed for total worm counts. Establishment rates were assessed comparing worm counts to the infective dose which were identified morphologically, and to the relative establishment rate of different species...
August 30, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28797791/the-use-of-nemabiome-metabarcoding-to-explore-gastro-intestinal-nematode-species-diversity-and-anthelmintic-treatment-effectiveness-in-beef-calves
#4
Russell W Avramenko, Elizabeth M Redman, Roy Lewis, Murilo A Bichuette, Bruna M Palmeira, Thomas A Yazwinski, John S Gilleard
Next-generation deep amplicon sequencing, or metabarcoding, has revolutionized the study of microbial communities in humans, animals and the environment. However, such approaches have yet to be applied to parasitic helminth communities. We recently described the first example of such a method - nemabiome sequencing - based on deep-amplicon sequencing of internal transcribed spacer 2 (ITS-2) rDNA, and validated its ability to quantitatively assess the species composition of cattle gastro-intestinal nematode (GIN) communities...
August 7, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28765867/-anthelmintic-resistance-in-ruminants-development-diagnostics-and-procedures
#5
Gabriela Knubben-Schweizer, Kurt Pfister
Anthelmintic resistance of gastrointestinal nematodes in small ruminants, but also in cattle and horses, is now found worldwide. The reason for increasing anthelmintic resistance is, in particular, the extensive use of all the anthelmintic agents available on the market. A non-targeted use leads to the selection of naturally occurring resistance genes within parasite populations. The most practical method for evaluating the efficacy of an anthelmintic is the fecal egg-count reduction test. To reduce the rate of anthelmintic resistance development, the available active substances must be applied less and in a targeted manner...
August 2, 2017: Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere
https://www.readbyqxmd.com/read/28576343/economic-assessment-of-ostertagia-ostertagi-and-fasciola-hepatica-infections-in-dairy-cattle-herds-in-germany-using-paracalc-%C3%A2
#6
Jane Fanke, Johannes Charlier, Torsten Steppin, Georg von Samson-Himmelstjerna, Jozef Vercruysse, Janina Demeler
The aim of the current study was to estimate economic costs of Ostertagia ostertagi and Fasciola hepatica infections in dairy cattle herds in Germany using the online calculation programme Paracalc(®). Following a questionnaire, survey data were available from 464 farms in 14 federal states. On those farms bulk tank milk (BTM) samples and additionally up to six serum samples collected from first season grazing calves were analysed, using a commercially available ELISA (Boehringer Ingelheim SVANOVA Biotech AB, Uppsala, Sweden), an in-house ELISA (F...
June 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28420411/characterization-of-a-novel-aspartyl-protease-inhibitor-from-haemonchus-contortus
#7
Baojie Li, Javaid Ali Gadahi, Wenxiang Gao, Zhenchao Zhang, Muhammad Ehsan, Lixin Xu, Xiaokai Song, Xiangrui Li, Ruofeng Yan
BACKGROUND: Aspartyl protease inhibitor (API) was thought to protect intestinal parasitic nematodes from their hostile proteolytic environment. Studies on Ostertagia ostertagi, Ascaris suum and Brugia malayi indicated that aspins might play roles in nematode infection. In a recent study, proteins differentially expressed between free-living third-stage larvae (L3) and activated L3 (xL3) of Haemonchus contortus were identified by 2D-DIGE. API was found downregulated in xL3 when compared with L3...
April 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28408216/modelling-the-impacts-of-pasture-contamination-and-stocking-rate-for-the-development-of-targeted-selective-treatment-strategies-for-ostertagia-ostertagi-infection-in-calves
#8
Zoe Berk, Yan C S M Laurenson, Andrew B Forbes, Ilias Kyriazakis
A simulation study was carried out to assess whether variation in pasture contamination or stocking rate impact upon the optimal design of targeted selective treatment (TST) strategies. Two methods of TST implementation were considered: 1) treatment of a fixed percentage of a herd according to a given phenotypic trait, or 2) treatment of individuals that exceeded a threshold value for a given phenotypic trait. Four phenotypic traits, on which to base treatment were considered: 1) average daily bodyweight gain, 2) faecal egg count, 3) plasma pepsinogen, or 4) random selection...
April 30, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28378195/characterization-of-ostertagia-ostertagi-annexin-like-proteins-at-different-developmental-stages
#9
Pooja Sharma, Mark Jenkins, Dante Zarlenga, Ray Fetterer, Zhengguo Xiao, Wenbin Tuo
Ostertagiosis remains an economically important parasitic disease in cattle in the temperate regions of the world. Repeated exposures to Ostertagia ostertagi in calves cause significant pathology in the abomasum but elicit little protective immunity. The larvae use the host's gastric glands as a niche for development, where the parasite completes its parasitic stages, while in the gastric glands, the larvae must down-regulate the host inflammatory immune responses. Annexin (ANX) A1, commonly found in most eukaryotes, is heavily involved in controlling anti-inflammatory responses by binding receptors on leukocytes...
May 2017: Parasitology Research
https://www.readbyqxmd.com/read/28288768/economic-modelling-of-grazing-management-against-gastrointestinal-nematodes-in-dairy-cattle
#10
M van der Voort, J Van Meensel, L Lauwers, M H A de Haan, A G Evers, G Van Huylenbroeck, J Charlier
Grazing management (GM) interventions, such as reducing the grazing time or mowing pasture before grazing, have been proposed to limit the exposure to gastrointestinal (GI) nematode infections in grazed livestock. However, the farm-level economic effects of these interventions have not yet been assessed. In this paper, the economic effects of three GM interventions in adult dairy cattle were modelled for a set of Flemish farms: later turnout on pasture (GM1), earlier housing near the end of the grazing season (GM2), and reducing the daily grazing time (GM3)...
March 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28259556/a-multi-country-study-to-assess-the-effect-of-a-treatment-with-moxidectin-pour-on-during-the-dry-period-on-milk-production-in-dairy-cows
#11
Thomas Geurden, David J Bartram, Hima Bindu Vanimisetti, Jane Fanke, Philippe Camuset, Jacques Devos, Andrew Sawyer, Georg von Samson-Himmelstjerna, Janina Demeler, Johannes Charlier
A randomized clinical study was conducted in a total of 45 commercial dairy farms in France (14 farms), Germany (28 farms) and the UK (3 farms) to evaluate the effect of an anthelmintic treatment on milk yield in the subsequent lactation. A total of 1287 animals with suspected exposure to Ostertagia ostertagi were included in the study. Animals were treated during the dry period (7-77days before parturition) with moxidectin pour-on (Cydectin(®) 0.5% Pour-On, Zoetis; 638 animals) or left untreated (649 animals) according to a randomized block design...
February 20, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28237225/end-season-daily-weight-gains-as-rationale-for-targeted-selective-treatment-against-gastrointestinal-nematodes-in-highly-exposed-first-grazing-season-cattle
#12
Aurélie Merlin, Alain Chauvin, Anne Lehebel, Nadine Brisseau, Sébastien Froger, Nathalie Bareille, Christophe Chartier
A two-year study was carried out to assess the feasibility of a targeted selective treatment to control gastrointestinal nematodes (GIN) in 24 groups of first grazing season (FGS) cattle. A two-step procedure aiming at defining exposure risk at group level and at identifying the most infected individuals within groups through measurement of the average daily weight gain (ADWG) at housing was used. The first step was to define retrospectively, by grazing management practices (GMP) indicators, two levels of groups' exposure to GIN determined by anti O...
March 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28120611/condensed-tannins-in-the-gastrointestinal-tract-of-cattle-after-sainfoin-onobrychis-viciifolia-intake-and-their-possible-relationship-with-anthelmintic-effects
#13
Olivier Desrues, Irene Mueller-Harvey, Wilbert F Pellikaan, Heidi L Enemark, Stig M Thamsborg
Condensed tannins' (CTs) fate along the digestive tract of ruminants may account for the variable efficacy of CTs against gastrointestinal nematodes. We analyzed CTs in the digesta of cattle fed sainfoin. With the acetone-butanol-HCl assay, the total CTs concentrations in the digesta were close to those in the diets (6.3 and 1.5% of DM in experiments 1 and 2, respectively); thus, CTs remained potentially largely undegraded/unabsorbed. With the thiolysis assay, CTs concentration was much higher in the abomasum (2...
February 22, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27915061/modelling-the-consequences-of-targeted-selective-treatment-strategies-on-performance-and-emergence-of-anthelmintic-resistance-amongst-grazing-calves
#14
Zoe Berk, Yan C S M Laurenson, Andrew B Forbes, Ilias Kyriazakis
The development of anthelmintic resistance by helminths can be slowed by maintaining refugia on pasture or in untreated hosts. Targeted selective treatments (TST) may achieve this through the treatment only of individuals that would benefit most from anthelmintic, according to certain criteria. However TST consequences on cattle are uncertain, mainly due to difficulties of comparison between alternative strategies. We developed a mathematical model to compare: 1) the most 'beneficial' indicator for treatment selection and 2) the method of selection of calves exposed to Ostertagia ostertagi, i...
December 2016: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/27905269/climate-influences-assemblages-of-abomasal-nematodes-of-sheep-on-steppe-pastures-in-the-east-of-algeria
#15
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
#16
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)...
December 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
#17
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
#18
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
#19
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
#20
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
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