A Sampling of Factors Relative to the Epidemiology of Gastrointestinal Nematode Parasites of Cattle in the United States

Yazwinski, T. A.; Tucker, Chris

doi:10.1016/j.cvfa.2006.07.005

Cited by 22 publications

(23 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Within the same season and year, it seems unlikely that local weather or climate differences could alone account for the different profiles, because, for example, the values seen in the neighbouring region of the Netherlands differ from those in Belgium. What is apparent for the Belgian figures is that there is some variation between years in the mean herd ODR values which is possibly related to local weather conditions that could affect parasite epidemiology and hence the magnitude of parasite populations (Yazwinski and Tucker, 2006). This possibility is supported by results of bulk milk sampling in the United Kingdom in Autumn 2007 (unpublished data), after a summer with above average rainfall, when ODR results were generally much higher than in the same region in Autumn 2005.…”

Section: Association Analysessupporting

confidence: 68%

A survey of the exposure to Ostertagia ostertagi in dairy cow herds in Europe through the measurement of antibodies in milk samples from the bulk tank

Forbes¹,

Vercruysse

Charlier

2008

Veterinary Parasitology

View full text Add to dashboard Cite

Measurement of antibodies to Ostertagia ostertagi in bulk tank milk (BTM) has value as a diagnostic indicator for potential production losses and anthelmintic treatment responses in dairy herds. Most of the recent data on O. ostertagi antibodies in milk have been generated in Belgium and Canada; the purpose of this study was to determine the range of O. ostertagi antibody levels in several European countries. BTM samples were collected during the autumn of 2005 and 2006 from a total of 1185 dairy herds from dairy farming regions in Denmark, Germany, Ireland, Italy, the Netherlands, Portugal, Spain and the United Kingdom. Antibody titres to O. ostertagi were determined by indirect ELISA and expressed as optical density ratios (ODR). In addition, relationships between ODR and management practices were investigated. For each country the mean ODR and the 25th-75th percentile values were determined. Mean BTM ODR values in herds with access to yards, paddocks and pastures ranged from 0.3 in Italy to 0.6 in Portugal and the UK/Ireland. The BTM ODR values obtained in this study were generally lower than those described in the literature for Belgium, but comparable with those in Canada. Variations between different European countries appeared to reflect different husbandry practices, particularly those related to access to pasture. The association analyses showed correlations between the BTM O. ostertagi ODR, outside access and grazing management, consistent with the publications from Belgium and Canada. When diagnostic values appropriate for different production situations and environments have been further validated, the test will provide an objective, quantitative assessment of the O. ostertagi status of a dairy herd and the possible impact this may have on performance and potential responses to anthelmintic treatment. This represents a significant step forward in evidence-based medicine for dairy veterinarians, advisors and farmers. #

show abstract

Section: Association Analysessupporting

confidence: 68%

A survey of the exposure to Ostertagia ostertagi in dairy cow herds in Europe through the measurement of antibodies in milk samples from the bulk tank

Forbes¹,

Vercruysse

Charlier

2008

Veterinary Parasitology

View full text Add to dashboard Cite

show abstract

“…Hence, adaptation is the main vital function, almost overdeveloped in parasites to preserve both individual and species survival. At the same time, the survival of a specimen depends, mostly, on feeding, while species survival is linked to its biological features (McSorley, 2003;Yazwinski & Tucker, 2006;Boyko et al, 2009Boyko et al, , 2016Blaxter & Koutsovoulos, 2015).…”

Section: Introductionmentioning

confidence: 99%

Comparative embryonic development of nematodes of the genus Тrichuris (Nematoda, Trichuridae) obtained from sheep (Ovis aries)

Мельничук

Berezovsky

2018

Biosys. divers.

View full text Add to dashboard Cite

Biological specifics of Trichuris оvis Abildgaard, 1795 and T. globulosa Linstow, 1901 parasitizing domestic sheep were analyzed enhancing the species identification of these nematode species. The embryonic development of nematodes was timed, survival of embryonic stages was determined taking into account their morphological and metric specifics in laboratory culture. Trichuris eggs were isolated from gonads of adult female nematodes collected from caeca of dissected sheep. Then the eggs were cultured at optimal temperature to the formation of eggs with mobile larvae. Six morphologically distinct stages of embryogenesis were established in T. оvis and T. globulosa nematodes. The protoplast stage lasted from the 1st to the 12th day in T. оvis and to the 18th day in T. globulosa. Blastomeric formation occurred from the 3rd to the 18th day in T. оvis and from the 3rd to the 21st day in T. globulosa. Bean-shaped embryos formed from the 6th to the 21st day in T. оvis, and from the 9th to the 30th day in T. globulosa. Tadpole-like embryos developed from the 12th to the 24th day in T. оvis and from the 18th to the 33rd day in T. globulosa. Larvae formed in eggs of T. оvis from the 18th to the 27th day, and in eggs of T. globulosa from the 21st to the 36th day. Mobile larvae formed from the 21st to the 30th day in T. оvis, and from the 30th to the 39th day in T. globulosa. At 27 °С, mature eggs with mobile larvae developed in 30 days in T. оvis and in 39 in T. globulosa. The egg survival in laboratory culture was 84.3 ± 4.2 % and 76.3 ± 1.5%, respectively. Developmental changes of metric parameters in Trichuris nematode eggs (length and width of eggs, plug length, eggshell thickness) were species-specific.

show abstract

“…Cattle are routinely infected with a variety of nematode parasites (Yazwinski and Tucker 2006). Coincident with the omnipresence of these nematodes, nematocides have been used extensively in the production of cattle.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness evaluation of several cattle anthelmintics via the fecal egg count reduction test

et al. 2009

View full text Add to dashboard Cite

Utilizing groups of cograzed, naturally infected beef-type heifers, three fecal egg count reduction tests were conducted in the later months of 2007 at the University of Arkansas. Each test was 28 days in length consisting of individual animal fecal nematode egg counts and coprocultures. Both original and generic ivermectin injectable formulations were used in two of the tests at 0.2 mg/kg BW, with FECR percentages never exceeding 90% in either test. Oral fenbendazole was evaluated at 5 and 10 mg/kg BW, with FECR%'s exceeding 90% on all occasions, but with a precipitous drop when recently treated animals were treated at the lower dose. Evaluated in one test, injectable moxidectin given at 0.2 mg/kg BW resulted in egg count reductions of 96-92% (days 7 to 28). Also evaluated in one test, albendazole delivered orally at 10 mg/kg BW was 98% and 97% effective at 17 and 28 days post-treatment. For all tests, coprocultures conducted post-treatment contained only Cooperia spp. larvae (benzimidazole use), relatively unmodified percentages of Cooperia spp. and Haemonchus spp. larvae (ivermectin use), and primarily Cooperia spp. larvae with a small percentage of Haemonchus spp. larvae (moxidectin use).

show abstract

A Sampling of Factors Relative to the Epidemiology of Gastrointestinal Nematode Parasites of Cattle in the United States

Cited by 22 publications

References 59 publications

A survey of the exposure to Ostertagia ostertagi in dairy cow herds in Europe through the measurement of antibodies in milk samples from the bulk tank

A survey of the exposure to Ostertagia ostertagi in dairy cow herds in Europe through the measurement of antibodies in milk samples from the bulk tank

Comparative embryonic development of nematodes of the genus Тrichuris (Nematoda, Trichuridae) obtained from sheep (Ovis aries)

Effectiveness evaluation of several cattle anthelmintics via the fecal egg count reduction test

Contact Info

Product

Resources

About