scholarly journals Assessment of the efficacy of commercial anthelmintics in horses naturally infected with gastrointestinal nematodes

2021 ◽  
Vol 15 (1) ◽  
pp. 28-32
Author(s):  
Natália Soares Martins ◽  
Diego Moscarelli Pinto ◽  
Laís Leal da Cunha ◽  
Júlia Somavilla Lignon ◽  
Thais Cozza dos Santos ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Lower Limit ◽  
Anthelmintic Resistance ◽  
Rio Grande ◽  
Gastrointestinal Nematodes ◽  
Southern Region ◽  
Rio Grande Do Sul ◽  
Fecal Egg Count ◽  
Anthelmintic Efficacy ◽  
South Of Brazil

The objective of this study was to assess the efficacy of commercial anthelmintics in horses naturally infected with gastrointestinal nematodes from the southern Rio Grande do Sul state, Brazil. The anthelmintic efficacy was assessed by fecal egg count reduction test (FECRT) and coproculture. Fecal samples were collected from 110 animals in seven farms located in the southern region of the state of Rio Grande do Sul, in the south of Brazil. Criteria used to suspect anthelmintic resistance included percentages of efficacy lower than 95% and a lower limit of the confidence interval below 90%. Anthelmintic resistance was detected in five of the seven farms studied. Coproculture results show that, even after horses were treated with anthelmintics, infection by nematodes of the subfamily Cyathostominae was still present in animals from five farms.

Assessment of anthelmintic efficacy against cattle gastrointestinal nematodes in western France and southern Italy

2020 ◽  
Vol 94 ◽  
Author(s):  
C. Chartier ◽  
N. Ravinet ◽  
A. Bosco ◽  
E. Dufourd ◽  
M. Gadanho ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Lower Limit ◽  
Southern Italy ◽  
Anthelmintic Resistance ◽  
Gastrointestinal Nematodes ◽  
Post Treatment ◽  
Arithmetic Means ◽  
Anthelmintic Efficacy ◽  
Faecal Egg Count ◽  
Cattle Farms

Abstract Our objective was to measure the efficacy of ivermectin (IVM) and benzimidazoles (BZ, i.e. fenbendazole and albendazole) in 15 cattle farms in western France and southern Italy. A total of 11 groups were treated with IVM and 11 with BZ. Efficacy was assessed by calculating the percentage of faecal egg count reduction (%FECR) using the pre- and post-treatment arithmetic means. Anthelmintic resistance was considered to be present when the %FECR was <95% and the lower limit of the 95% confidence interval <90%. For IVM, the percentages of FECR ranged from 73% to 100%. Lack of efficacy to IVM was detected in two farms out of four in France, but was not detected in any of the seven farms in Italy. For BZ, the percentages of FECR ranged from 95% to 100%. No case of BZ resistance was detected in the five farms in France and the six farms in Italy.

scholarly journals Anthelmintic resistance in Creole horses in the South of Rio Grande do Sul, Brazil

2021 ◽  
Vol 73 (3) ◽  
pp. 598-604
Author(s):  
J.S. Lignon ◽  
N.F. Gonçalves ◽  
L.L. Cunha ◽  
T.A. Antunes ◽  
M.S. Leão ◽  
...  
Keyword(s):  
Anthelmintic Resistance ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
The South ◽  
Fecal Egg Count ◽  
Anthelmintic Efficacy ◽  
Stool Samples ◽  
Antiparasitic Drugs ◽  
Veterinary Faculty ◽  
Antiparasitic Agents

ABSTRACT The objective of the study was to evaluate the antiparasitic resistance against horse nematodes in the South of Rio Grande do Sul, Brazil. The results concerning the tests of anthelmintic efficacy on horses, stored in the database of the Parasitic Diseases Study Group (GEEP) - Veterinary Faculty, at the Federal University of Pelotas (UFPel), were carried out in the laboratory from 2018 to 2019. Stool samples were received from farms with breeding of adult female and male Criollo horses naturally infected, located in municipalities in the country’s southern region. The antiparasitic agents tested were Triclorfon + Fenbendazole, Closantel + Albendazole, Ivermectin + Praziquantel, Fenbendazole, Ivermectin, Doramectin, Mebendazole and Moxidectin. Techniques such as Gordon and Whitlock, Coproculture and Fecal Egg Count Reduction Test were performed. Of all the antiparasitic drugs tested, it was observed that only treatments with Ivermectin 2% showed desired values. The observed results indicate that resistance to macrocyclic lactones is usual in equine parasites in this Brazilian region, despite the results with isolated Ivermectin.

scholarly journals Multiple anthelmintic resistance in Southern Brazil sheep flocks

2017 ◽  
Vol 26 (4) ◽  
pp. 427-432 ◽  
Author(s):  
Plínio Aguiar de Oliveira ◽  
Beatriz Riet-Correa ◽  
Pablo Estima-Silva ◽  
Ana Carolina Barreto Coelho ◽  
Bianca Lemos dos Santos ◽  
...  
Keyword(s):  
Anthelmintic Resistance ◽  
Rio Grande ◽  
Gastrointestinal Parasites ◽  
Southern Region ◽  
Parasitic Infections ◽  
Southern Brazil ◽  
Parasite Control ◽  
Rio Grande Do Sul ◽  
Parasitic Resistance ◽  
The Common

Abstract Gastrointestinal parasites represent an important cause of reduced productivity of sheep worldwide. As anthelmintic are still the main control tool for these parasites, this work evaluated the efficacy of commercially available active principles in 22 sheep flocks in the southern region of Rio Grande do Sul, Brazil. In each farm 10 sheep were randomly distributed in seven groups with the following treatments: abamectin; albendazole; closantel; levamisole; monepantel; trichlorphon and no anthelmintic (control). All flocks showed resistance to at least three anthelmintics and in 20 farms only two products demonstrated efficacy for parasitic control. In two farms, there was no susceptibility to the six active principles tested. The results of this study provide evidence that the common commercially available anthelmintic are not assuring effective chemical control of gastrointestinal parasitic infections in ovine flocks in the southern region of Rio Grande do Sul. Monepantel, the newest introduced drug in the Brazilian market was not effective in 18% of the flocks tested, confirming that the parasitic resistance can be established quickly after the introduction of new molecules mainly when alternative program of parasite control is not performed.

scholarly journals Status of anthelmintic resistance of gastrointestinal nematodes in organized sheep and goat farms

2018 ◽  
Vol 4 (4) ◽  
pp. 378-382 ◽  
Author(s):  
Saiful Islam ◽  
Anita Rani Dey ◽  
Shirin Akter ◽  
Hiranmoy Biswas ◽  
Md Hasanuzzaman Talukder ◽  
...  
Keyword(s):  
Lower Limit ◽  
Anthelmintic Resistance ◽  
Small Ruminants ◽  
Gastrointestinal Nematodes ◽  
Fecal Samples ◽  
Resistant Parasite ◽  
Fecal Egg Count ◽  
Sheep Farm ◽  
Before And After ◽  
The Status

Anthelmintic resistance has become a global problem that threatens livestock production worldwide. The present study was investigated the status of anthelmintic resistance in gastrointestinal (GI) nematodes of small ruminants in two organized sheep and goat farms in two different areas of Bangladesh by fecal egg count reduction test (FECRT) for albendazole, levamisole and ivermectin. In each farms, naturally infected animals were divided into four groups of 10 animals. Fecal samples from each group were collected on day 0 and day 14 of post treatment to measure the eggs per gram of feces (EPG). The fecal samples of each group before and after treatment were also considered for culture to identify resistant parasite. In case of organized sheep farm, the result of FECRT of albendazole was 90.17, 95% confidence with upper and lower limit was 97.82 and 55.68, respectively. The result of FECRT of levamisole and ivermectin was 98.25 and 96.77, 95% confidence with upper and lower limit was 99.79, 85.12 and 99.11, 88.31, respectively. In case of organized goat farm, the result of FECRT of albendazole was 100, 95% confidence with upper and lower limit was 0 and 0, respectively. The result of FECRT of levamisole and ivermectin was 97.99 and 100, 95% confidence with upper and lower limit was 99.59, 90.28 and 0, 0 respectively. The results revealed that gastrointestinal nematodes were found to be resistant to albendazole in organized sheep farm and suspected to be resistant to levamisole and ivermectin. In organized goat farms, the GI nematodes found to be susceptible to all anthelmintics used for this study. Coproculture revealed that Haemonchus spp. were resistant parasite in sheep farm. This seems to be the first documentation of anthelmintic resistance against GI nematodes in organized sheep and goat farms in Bangladesh. Appropriate measures need to be taken to overcome the situation. Asian J. Med. Biol. Res. December 2018, 4(4): 378-382

scholarly journals Resistance to monepantel in multiresistant gastrointestinal nematodes in sheep flocks in Rio Grande do Sul

2018 ◽  
Vol 39 (5) ◽  
pp. 2059 ◽  
Author(s):  
Pedro Marino Mallmann Júnior ◽  
Raquel Fraga e Silva Raimondo ◽  
Beatriz Riet Correa Rivero ◽  
Luiza Rodegheri Jacondino ◽  
Andressa Silveira Gonçalves ◽  
...  
Keyword(s):  
Anthelmintic Resistance ◽  
Rio Grande ◽  
Gastrointestinal Nematodes ◽  
Control Measures ◽  
Current Status ◽  
Active Principle ◽  
Rio Grande Do Sul ◽  
Parasite Resistance ◽  
Fecal Samples ◽  
Anthelmintic Drugs

The excessive, indiscriminate, and continued use of anthelmintic drugs as control methods favors parasite resistance, and this phenomenon has been reported in Brazil and worldwide. The current status of parasite resistance to anthelmintic drugs in sheep flocks in Rio Grande do Sul was assessed by calculating the EPG count in the stool to estimate the prevalence of resistance to the anthelmintic drugs closantel, levamisole, fenbendazole, monepantel, and moxidectin in seven properties. The animals from each flock were randomly distributed in six groups according to the anthelminthic drug used, as follows: T1, levamisole; T2, fenbendazole; T3, monepantel; T4, moxidectin; T5, closantel; and T6, control. On day zero, fecal samples were collected, and each animal was treated with one anthelminthic drug. Fecal samples were collected again after 14 days to calculate the efficacy of each active principle. Coproculture was performed using a pool of fecal samples from each group on day 0 and 14 to identify the predominant genera and prevalence of helminths. The genera identified in the coprocultures were Haemonchus, Trichostrongylus, Oesophagostomum, and Teladorsagia. All flocks developed resistance to levamisole, fenbendazole, moxidectin, and closantel. Moreover, resistance to monepantel was found in four of the seven farms. These results demonstrate the critical situation of anthelmintic resistance in sheep flocks in Rio Grande do Sul and the need to adopt other integrated control measures in addition to anthelmintic treatment.

scholarly journals Anthelmintic resistance in gastrointestinal nematodes of beef cattle in the state of Rio Grande do Sul, Brazil

2016 ◽  
Vol 6 (1) ◽  
pp. 93-101 ◽  
Author(s):  
Fernanda Ramos ◽  
Luiza Pires Portella ◽  
Fernando de Souza Rodrigues ◽  
Caroline Zamperete Reginato ◽  
Luciana Pötter ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Anthelmintic Resistance ◽  
Rio Grande ◽  
Gastrointestinal Nematodes ◽  
The State ◽  
Rio Grande Do Sul

Field and Molecular Evaluation of Anthelmintic Resistance of Nematode Populations from Cattle and Sheep Naturally Infected Pastured on Mixed Grazing areas at Rio Grande do Sul, Brazil

2019 ◽  
Vol 65 (1) ◽  
pp. 118-127
Author(s):  
Fernanda Ramos ◽  
Camila Balconi Marques ◽  
Caroline Zamperete Reginato ◽  
Patricia Bräunig ◽  
Vanessa Osmari ◽  
...  
Keyword(s):  
Anthelmintic Resistance ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Molecular Evaluation ◽  
Cattle And Sheep

New records of the occurrence of biting midges (Diptera: Ceratopogonidae) species in rural area of Santa Maria, Rio Grande do Sul, in the South of Brazil

2022 ◽  
Author(s):  
Julia Somavilla Lignon ◽  
Emanuelle de Souza Farias ◽  
Felipe Arley Costa Pessoa ◽  
Eduarda Maria Trentin Santi ◽  
Lucas Alexandre Farias de Souza ◽  
...  
Keyword(s):  
Rural Area ◽  
New Records ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
The South ◽  
Biting Midges ◽  
South Of Brazil ◽  
Santa Maria

scholarly journals Use of LST images from MODIS/AQUA sensor as an indication of frost occurrence in RS

2015 ◽  
Vol 19 (10) ◽  
pp. 920-925 ◽  
Author(s):  
Débora de S. Simões ◽  
Denise C. Fontana ◽  
Matheus B. Vicari
Keyword(s):  
Spatial Distribution ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Weather Stations ◽  
Aqua Satellite ◽  
South Of Brazil ◽  
June July ◽  
Minimum Air Temperature

ABSTRACTAlthough frost occurrence causes severe losses in agriculture, especially in the south of Brazil, the data of minimum air temperature (Tmin) currently available for monitoring and predicting frosts show insufficient spatial distribution. This study aimed to evaluate the MDY11A1 (LST – Land Surface Temperature) product, from the MODIS sensor on board the AQUA satellite as an estimator of frost occurrence in the southeast of the state of Rio Grande do Sul, Brazil. LST images from the nighttime overpass of the MODIS/AQUA sensor for the months of June, July and August from 2006 to 2012, and data from three conventional weather stations of the National Institute of Meteorology (INMET) were used. Consistency was observed between Tmin data measured in weather stations and LST data obtained from the MODIS sensor. According to the results, LSTs below 3 ºC recorded by the MODIS/AQUA sensor are an indication of a favorable scenario to frost occurrence.

scholarly journals Genetic divergence among Nellore breed herds raised in the South Region of Brazil

2013 ◽  
Vol 43 (5) ◽  
pp. 878-883
Author(s):  
Jader Silva Lopes ◽  
Paulo Roberto Nogara Rorato ◽  
Tomás Weber ◽  
Ronyere Olegário de Araújo ◽  
Dionéia Magda Everling ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Genetic Divergence ◽  
Rio Grande ◽  
Southern Region ◽  
Rio Grande Do Sul ◽  
The South ◽  
Santa Catarina ◽  
Weaning Weight ◽  
Breeding Values ◽  
Ward Method

The objective of this study was to evaluate the genetic divergence among Nellore breed animals raised in 45 farms in the Southern Region of Brazil. The characteristic studied was weaning weight adjusted to 205 days of life (P205), from 10,874 animals sired by 425 bulls and 7,629 cows, collected between 1976 and 2001, and distributed in the states of Rio Grande do Sul (1,499), Santa Catarina (2,332) and Paraná (7,043). The animals were distributed by cluster analysis in eight genetic divergent groups, enabling this technique to be applied to organize the matings in order to obtain heterotic effect. The herd/farm groups were formed through the hierarchical Ward method, using the direct (VGD) and maternal (VGM) breeding values predicted by the REML method. The VGD of the animal accounted for 90% of the differences among herds, and the remaining 10% was attributed to differences in the VGM. On average, the P205 for the animals from inter-group mating was 1.4kg higher than those from intra-group mating, representing 2.4% of heterosis.

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